1. NO COTTON! 2. Layer with technical fabrics(
CoolMax, Dri-Fit, etc.) 3. Block the wind 4.Protect the extremities For each part, I'll list from skin out. Head-Fleece headband or ski cap Torso- short sleeve/long sleeve shirt, second shirt if needed, breathable jacket or vest(some have removable sleeves). Legs-underwear-look for the type that have wind shield over the crotch.), ...