sheex active comfort sheet set powered,ultra-soft, breathes better than cotton - pewter, king/cal king sheex 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.