The ACTIVE COMFORT Sheet Set Powered By SHEEX is designed to create ideal sleeping conditions. Our cooling and breathable sheet set includes a fitted sheet, flat sheet, and two pillowcases. Our luxurious, ridiculously-soft, performance fabric breathes up to 10x better than traditional cotton, and wicks moisture to ensure you get the most restful and restorative night sleep possible. SHEEX Performance Sleep | Sleep Cool. Sleep Dry. Sleep Comfortable.