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Calvin Klein boxer briefs are discounted up to 48% off.

There's only one way to say this: sweat-stained T-shirts and socks full of holes have no room in your wardrobe (or your life, for that matter). It is something we're all guilty of—myself included. For some reason, we forget that a fresh new six-pack of socks costs about the same price as an average food delivery. Except now it's Amazon Prime Day, so they cost even less.

Along with a host of menswear finds under $100, Amazon has slashed the prices on some of its most popular socks, underwear, and undershirts. Everyone's favorite Calvin Klein boxer briefs are discounted up to an unheard of 48% off (though take note that the discount varies between different color combinations and sizes). A 12-pack of crisp white Hanes moisture-wicking crew socks is only $10 right now, setting you back less than $1 per pair. In the undershirt department, snag a few Calvin Klein modal crew neck T-shirts while they're on sale—they're so much more comfortable than a standard cotton undershirt when you're wearing a dress shirt. Or if tank tops are your thing, Hanes performance tanks, which make for a great gym shirt, too, are nearly 70% off.

In case you missed it, Prime Day is kicked off yesterday, July 12, and runs through 11:59 p.m. PDT on July 13/2:59 a.m. EDT on July 14. These deals have a rapidly approaching expiration date, so shop now before they inevitably sell out—some have.

An indisputable classic, and for very good reason.

If you aren't afraid of a little color, opt for a five-pack for even more savings. It'll only set you back $7 per pair.

Plaid, stripes, or polka, whatever your favorite type of boxers, this pack's got 'em all.

These breathable mesh boxer briefs will keep you cool and dry during workouts or hot days in the sun.

Perfect for when you're wearing shorter shorts, these trunks have the same support as boxer briefs but with a shorter length. They're also made of a breathable microfiber fabric that will keep you cool and dry.

A 12-pack for $10? Can't beat it. Plus, these socks are great for casual wear or workouts alike thanks to the moisture-wicking fabric blend.

A color for (almost) every day of the week.

These are great everyday socks, complete with moisture-wicking Dri-Fit technology, an arch support band, and extra cushioning under the heel and toes.

These are true no-show shocks that will disappear completely when you put on shoes, but they still have the breathability and support of Adidas' other athletic socks. Great for dress shoes, loafers, or any time you want to free the ankle.

Patterned socks add a little something extra to any outfit. If blue and green aren't your colors, 26 other color and pattern options are also on sale.

We know your white undershirts have seen better days. Out with the old, in with the new.

Sometimes, for reasons that only present themselves in the moment you're getting dressed, a white undershirt won't cut it. Have this black one handy next time. (The modal fabric is super comfy under stiff clothing, too.)

First thing's first: this 2-pack of tanks is nearly 70% (!) off for only $11, or $5.50 each. What's more, this isn't your standard tank top undershirt, it's a performance material that's smooth to the touch and moisture-wicking, so you could wear it as an undershirt or on its own.

Or, keep it classic with Fruit of the Loom's ribbed tank tops.