Many of our customers have discovered that bicycle shorts make riding more comfortable, but they still wear their comfy old cotton T-shirt. Cotton may work fine in the gym, but for biking, it is the wrong fabric. It collects sweat on the uphill ride, and then holds it for a chill on the descent, or in the wind. It feels both hotter and colder than microfiber. Criterium carries ‘technical T’s’ made of wicking microfibers in addition to the traditional cycling jerseys for men, women, and kids. Think of them as high-speed T’s.