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Underwear. You won't give it a second thought if it's fabulously comfortable, but if it's anything less than that, it's all you'll be able to think about all the livelong day. And let's be honest — you're way too busy to waste any brain space on something as trivial as underwear. But thankfully, there are plenty of options these days that are as comfortable as they are coquettish, and you really can't ask for more when it comes to your undergarments.

Long gone are the days of a one size fits all approach to your lingerie. Today, you have plenty of styles, cuts, patterns, and sizes to make you feel confident and sexy from the moment you begin to get dressed. After all, they say beauty comes from within, right?

When it comes to deciding what underwear is best for you, trying really is believing. Luckily, most online underwear companies today have a satisfaction guarantee, so if you receive a pair and realize that the material isn't what you thought it would be, or the fit isn't quite right, don't try to force yourself into liking them. You deserve better than that.

Speaking of material, that's certainly key to keep in mind when selecting the best undergarments for your lifestyle. Are you constantly moving around for a living, or are you generally sitting at a desk? Do you need something a bit more breathable, or are you seeking, say, fuller coverage? Ultimately, you'll need to be sure that whatever material you're working with is durable. After all, these are garments that you'll be putting through the wash a lot, so be sure it can stand up to the spin cycle (unless you want to be like Justin Bieber and throw your underwear away after a single wash).

Hand in hand with material comes the underwear style. If you're always slipping into figure-hugging dresses, you may want to consider a thong. If you're really just looking for something to lounge around in on the weekend, perhaps consider a boyshort.

No matter what you choose from our favorite options, we're confident that you'll feel well-suited to take on the world and anything it throws your way.

For too long women's underwear has been about sex appeal instead of comfort, but no longer. Tommy John's underwear is hands down the most comfortable underwear you can buy.

Tommy John may have started off with men's underwear, but its new Second Skin and Air underwear collections for women prove that the company's designers know a thing or two about what women want in a great pair of underwear. That means no scrunching, chafing, bunching, or riding up. And boy does Tommy John's underwear deliver on its promise that there will be "no adjustment needed."

The Insider Picks team tested out both the Second Skin and Air underwear collections and loved every pair. From the sexy thong and cheekie styles to the practical and attractive briefs, Tommy John's underwear is super comfortable.

I particularly loved the Second Skin Brief, which is made from 90% micro-modal and 10% Spandex. It gives full coverage everywhere you need it without embarrassing panty lines. Most importantly, it looks good, feels great, and never needs adjusting throughout the day.

The entire Second Skin collection is made from the same material, so you can choose the boyshorts, thong, or cheekie instead of the brief, too. Tommy John has lots of color options, too, including a nice deep purple, a deep rosy pink, white, black, nude, and more.

The Air collection is fantastic for hotter weather or workouts because it's made with improved ventilation, moisture wicking, and deodorizing fabric. The Air underwear comes in briefs, cheekies, and thongs that are made from 77% Nylon mesh and 23% Spandex.

I really liked the cheekie Air underwear for its comfortable fit and ventilated fabric. My fellow co-workers were also fans of the Air thong for its barely-there feel.

The only real downside here is the price, because at $22 and up, this underwear is very expensive. We recommend going with a value pack to minimize the cost a bit. Besides, you're going to want to wear these every day, so you'll need more than one pair. — Malarie Gokey

Pros: So comfortable, great fit, fun colors, many styles, innovative breathable fabric, no adjustments

If you don't want to spend $22+ on one pair of underwear, you're in luck, because Everlane just created its first underwear collection. The online company is known for its transparent pricing and ethically produced clothing, so you can feel good about the underwear you're buying.

Everlane's underwear collection features bikini, thong, hipster, and high-rise hipster styles that are all made with Supima cotton that's grown in the United States and made into underwear at ethical factories. The cotton's extra long fibers are super soft on your skin and the material is breathable.

We at Insider Picks reviewed Everlane's underwear, and we loved it. The high-rise hipster was a group favorite with its full coverage and comfortable feel. I also personally loved the regular hipster style, which is both sexy and comfortable. Those of us who prefer thongs were also favorably impressed with Everlane's take on that classic sexy style.

You can choose from heather grey, powder pink, white, and black colors. All of Everlane's underwear is completely basic, or as the ad campaign says, "No frills. No bows. No bullsh*t." It's your everyday underwear. It's made for you and puts your comfort above anything else.

Perhaps best of all, one pair of Everlane underwear costs $12, which is nearly half the price you'd pay for a pair of Tommy John's underwear. You can get a three-pack for $27, which averages out to $9 a pair.

If you're looking for affordable, high-quality underwear that's made ethically from the best material, Everlane's Supima cotton underwear is for you. — Malarie Gokey

Pros: Supima cotton is soft, comfortable, breathable, variety of styles, comfortable elastic, ethical production, transparent pricing

You may know ThirdLove best for its bras, which come in half cup sizes (yes they do) and have helped many women take the pain out of bra shopping. But if you thought that the company's expertise stopped in the upstairs department, think again. ThirdLove's underwear may not be as famous as its bras (yet), but we anticipate that will soon change.

Available in thong, cheeky, and bikini cuts, ThirdLove's underwear is supremely comfortable, and better yet, practically invisible. All of its styles come in seamless varieties, which means that you don't have to get a thong in order to have a no-show look. And while it's difficult to get 340 women to agree on anything, it looks like a positive opinion of the seamless thong is about as close to a consensus as we're going to get.

Hundreds of buyers have given the Seamless Thong an average of 4.5 out of five stars, with women noting that the "simple design" and "comfy material" contribute to an overall enjoyable wearing experience. The seamless options of ThirdLove's underwear are made of a nylon and spandex mix, while the brand's lace options have a rayon element in addition to the nylon and spandex.

As Sheaffer of Sheaffer Told me To noted in her own review of ThirdLove, the company offers "quite a large selection of undies to choose from." ThirdLove sent the Insider Picks team a few pairs to try, including the seamless thong, the lace bikini, and the seamless cheeky. All three styles were very comfortable, silky smooth, and very attractive looking. We loved the fun colors and the sexy little details.

ThirdLove provides a pretty precise sizing chart that includes hip measurements down to the half inch to help you decide if you're an extra small, medium, or xx-large. Regardless of your size, you should be able to find a pair of panties that fit your body the way it ought to. And if not, ThirdLove maintains a 100% fit guarantee, and always offers free returns and exchanges. — Lulu Chang

It's not often that you're going for a laugh as you get down to your skivvies, but if you're wearing MeUndies underwear, you just might get an appreciative chuckle. And that, we would like to point out, is a great thing. MeUndies not only has incredibly comfortable underwear, but it also maintains a fantastic sense of humor, which isn't something you see all that often in underwear, particularly women's underwear.

MeUndies has a wide range of styles available, all of which come in a fun selection of prints or solids. If you're really looking to be bold, you can select one of the company's "Adventurous" prints to go on a pair of boyshorts, which will provide you with plenty of coverage, and a pretty big canvas to admire the bananas or the flags of the world that MeUndies offers as patterns.

Or, you can opt for a thong, which will have less surface area, but still comes in fun print options like Fireworks, Lucky Bamboo, and 8-Bit Alpine.

All underwear is available in sizes from an XS to an XXL, and you choose from classic colors, bold colors, or adventurous prints. Because these prints change on a regular basis, if you opt for one of MeUndies' many subscriptions, you'll always get a new (and exciting) pair to try on.

Both the men's and women's underwear from MeUndies is made of 92% MicroModal and 8% elastane, and promises to be three times softer than cotton. Folks certainly agree with this claim. The Insider Picks team loves MeUndies, and Buzzfeed called these undergarments "SO freakin' comfy."

I can certainly attest to their ease of wear as well. But honestly, when you have dancing tacos on your underwear, does anything else really matter? — Lulu Chang

Sometimes, the name is all you need. Underwear from Commando will make you look (and feel) as though you're not wearing undergarments in the best way possible. People Magazine notes that "you'll never fall victim to pesky panty lines ever again" with this lingerie, and really, what more could you want from your underwear?

Commando has one of the wider selections of styles when it comes to online panty retailers. You can select your underwear by type, with options including high rise, active, boy short, and thong, to name a few. Alternatively, you can filter your search results based on materials, which are also wide-ranging on the Commando site. Options include chic mesh, signature microfiber, perfect stretch, luxe, and lace satin, among others.

With the exception of a few styles, colors in the Commando line are generally muted and quite classic. So if you need to find a pair of underwear for the cocktail dress you're wearing to the charity gala, you'll probably want to pull out a pair of Commandos.

New York Magazine says that Commando ticks all the boxes when it comes to both comfort and functionality, and this assessment certainly rang true for me as well. As Jasmine Caccamo, professional stylist noted, "These seamless undies create a super-flawless fit and everything looks perfect — whether I'm wearing them under leggings or a silk cami dress." — Lulu Chang

For those of us who don't want our underwear to be just barely there, the hipster is a real gift from above. And nothing is quite so deserving of praise as the hipsters from True&Co.

No, we're not talking about some counter-culture movement here — rather, the hipster underwear from this San Francisco-based company promises to be everything you need it to be, every single time.

The founder and CEO of the company herself, Michelle Lam, told Who What Wear that this is the one type of underwear that you can put on for every outfit and every occasion. Whether it's the brand's True Body Hipster (which is seamless with "buttery-soft comfort"), or the Best Lace Hipster Ever (which is as light as it is sexy), or the Argyle Mesh Hipster (which has a five star review from 42 happy customers on the True&Co website), you'll be able to find a pair that suits your needs.

One happy reviewer called these "the most comfortable hipsters I've ever worn," and plenty others have noted that you could "almost forget you're wearing them." If you have sensitive skin, this could be the underwear for you. The careful construction and minimal seams mean that you won't have any fabric digging uncomfortably into your side.

Like ThirdLove, True&Co got its start by re-conceptualizing the process of buying a bra, but we're definitely glad that the company expanded into other intimates as well because frankly, the underwear might be even better than the bras. — Lulu Chang

Cons: Some reviewers note that the tag on the back of underwear is itchy, but cutting it off seems to solve the problem

Great underwear can also come at a great price, and that's precisely where Aerie by American Eagle comes in. Before you write this brand off as one that is only appropriate for tweenaged girls, hear this: You can get 10 pairs of comfortable undies for just $35. So really, if your bank account looks about the same as it did when you were 13 (no shame if it does), Aerie is a serious contender for your business.

Beyond the unbeatable price point, however, Aerie also makes truly comfortable and dependable underwear. Simple and unfussy, the majority of these undergarments are made of good ol' cotton. But buyers certainly don't seem fazed by the lack of rayon, satin, and silk. Rather, a slew of five-star reviews proclaim that Aerie's Cotton Boybriefs are "so comfortable, you almost forget you're wearing them," and that (unlike many other brands) "the fit is great."

To say that Aerie has a wide selection would be an understatement — No matter what kind of style or color or print you're looking for, this brand has it.

Active Leggings

Folks over at Jezebel have also been singing Aerie's praises for years, with Madeleine Davies writing that these underwear are the reason that she doesn't "put off doing laundry for an extra week." If that's not high praise, we don't know what is.

And if all this isn't enough to convince you to give Aerie a try, perhaps the message that the company is trying to send will do the trick. The brand's #AerieReal campaign may have first debuted in 2014, but it's still appealing to women who aren't buying underwear from airbrushed supermodels. The company has long pushed for honest acceptance of women's bodies, and when it makes underwear this wearable, it's pretty easy to accept yourself. — Lulu Chang

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