"RRS® Endorphin Hat: The RRS® Endorphin Hat is a lightweight running cap built for outdoor training, daily runs, and warm-weather workouts where sun coverage and breathability matter. The curved bill reduces glare so you can stay focused on the road ahead without squinting, while the woven polyester construction keeps your head cool as effort and temperature rise. An adjustable snap buckle accommodates a wide range of head sizes and hairstyles, making it easy to dial in the fit without fuss.The lightweight woven polyester fabric is the key to comfort during active use - it stays breathable and doesn't feel stifling as you warm up. The structured curved bill does real work reducing glare, which means you can maintain your focus and form on longer efforts. The snap buckle adjustment takes seconds and holds reliably, so whether you're sharing gear with a training partner or just want a hat that fits the same way every time, you'll appreciate the simplicity.Why Our Fit Experts Love It""I grabbed the Endorphin Hat for a sunny afternoon run and appreciated how light it felt on my head - the curved bill kept the glare out of my eyes without adding any bulk. The snap buckle took about two seconds to adjust, and it stayed put through the whole run."" - Sawyer, Road Runner Sports Fit Expert, Wilmette ILWho It's Best ForThe RRS® Endorphin Hat is best for runners, walkers, and outdoor athletes who want reliable sun protection without weight or bulk. If you're training in warm weather, running road routes with strong sun exposure, or simply need a hat that adjusts quickly to fit different head sizes and hairstyles, this unisex cap delivers straightforward performance. It's an ideal choice for anyone building a practical gear rotation for everyday training. VIP Family members can take the Endorphin Hat for a 90-Day test drive with our Perfect Fit Guarantee."