We've got your online savings for April 2020, with 1 new UnderAir Promo Codes and the best Coupons to save a bundle at underair.com. UnderAir - Feels Barely There! Made with the softest MicroModal on the market. Underair is the only clothing with our kelp-based Seeweev material. It's so amazing at odor control you can wear them for 5 days before washing! All our clothing comes with Ready-to-Wear pre-wash service so you can put it on as soon as it arrives.