A swimskin is for triathletes racing non-wetsuit swims. It's worn over your race kit to reduce drag in the water. You take it off after the swim, just like you would a wetsuit. A swimskin should fit snugly, almost like a second skin -- we love the fit of the PZ4TX. The fabric feels super lightweight and doesn’t soak up water, so we've never felt weighed down mid-swim. The seamless design of the skin also minimizes chafing, which is a lifesaver for longer races (if you know, you know). If you’re racing a non-wetsuit legal swim, and want something that gives you a competitive edge, this suit will get the job done!