Giro Seasonal Merino Wool Cycling CapKeep your head warm during cold weather rides with the Giro Seasonal Merino Wool Cycling Cap. Merino Wool is a staple in almost every cyclist's wardrobe and that's thanks to its insulating and breathable qualities. The Giro Seasonal Merino Wool Cycling Cap relatively lightweight, comfortable and easy to carry or wear when you're off the bike. It's thin enough to be comfortably worn under a helmet and features an updated panel construction that prevents bunching. FeaturesWinter weight Australian Merino wool blend keeps your head warm and provides breathabilityX-Static(R) liner for comfortReinforced brim durableBlueSign Approved fabricoffers the highest level of consumer safetyEar flaps fold up or downGiro Helmets (Superfit)HELMET SIZE CHARTSizeOne SizeHead Diameter (in)20-25 | Giro | Seasonal Merino Wool Cycling Cap Men's | Size Small/Medium in Black