Instead of wearing a cotton shirt beneath your drysuit, wear something that's actually going to do some good like the Bomber Gear Women's Halo 5. 0 Short Sleeve Top. Made with a moisture wicking, antimicrobial, 4 way stretch fabric, the Halo 5. 0 is specifically designed to keep you dry and comfortable whether you're sending steep creeks, play boating at your local whitewater park, or just relaxing around the campfire after a long day on the river. The shirt features Polartec Power Dry side panels for exceptional breathability and moisture management properties, and it has flat locked seams to eliminate rubbing and chafing.