The Brief Starter KitThis is for you. A first timers exclusive to experience Underdays, thoughtfully designed with your health, comfort, and style in mind. The Starter Kit includes 3 briefs, and a pouch thats perfect for storing your essentialsthe perfect introduction to the underwear brand that is changing the game.

that lets them pick ultra-comfortable

Stay comfortable and supported throughout the day with The Tank and Thong set

Underwear styles they can choose themselves

and a pouch that’s perfect for storing your essentials—the perfect introduction to the underwear brand that is changing the game

The Starter Kit includes 1 Workout Thong

No chafing

Part activewear

Our breathable

The ultimate treat

Your search for all-day comfort and style ends here

no riding up and minimal VPL

The Tank's built-in bra and our best selling quick-dry Workout fabric makes this your go-to for life errands