With its pack of performance features, the Sunstopper base layer keeps our riders cool, crisp, and collected in the saddle. Breathable mesh panels prompt enhanced cooling while odor control and sun protection fabric. AriatTEK for superior performance in any weather Moisture Movement Technology wicks away moisture from skin Climate TEK for dynamic and temperature regulated cooling Fresh TEK sustainable odor-resistance Sun Protection Fabric with UPF rating 50 Mock collar Quarter zip styling Returns are welcome! To protect both buyers and sellers, each item includes an invisible ID mark or a tamper‑proof tag. Returned items must have the original tag fully intact. All items come from a smoke‑free home with pets. Some pieces may have had previous owners, so we cannot guarantee they are completely smoke‑free. If you have allergies, please shop thoughtfully and reach out with any questions. We believe in reusing materials whenever possible.