REI Airflyte Cap
Here's what other sites are saying:
Don't let a little rain ruin your plans. Pull on the REI Airflyte cap with eVent(TM) fabric to keep your noggin dry throughout the day. eVent fabric has a unique membrane structure that allows sweat vapor to escape to the outside of the fabric in 1 easy step. No matter how hard you work, overheating is highly unlikely due to this Direct Venting(TM) technology. CoolMax(R) polyester sweatband wicks moisture away from your brow and speeds the evaporation process. Reflective hits increase visibility in low light. Strap in back adjusts the fit of the REI Airflyte cap; 1 size fits most.