Accessories? Must-haves seems more accurate. Brooks high-performance caps, socks, hats and gloves are packed with technology and features that enhance your run all year-round. Breathable mesh caps with advanced moisture-transfer technologies and glare-reduction under-bills help you keep a cool head, while HVAC socks with thermo-regulating X-STATIC®, The Silver Fibre™, move heat away from the foot and kill 99.9% of bacteria within one hour. If these sound like "extra's", they're extras we dont want to run without.