A calf-high, medium thickness sock for hunting, fishing and exploring, UpHillSport “Ukko” Hunting 4 Layer M4 Socks are inspired by multi-day hunting or fishing expeditions where consists and temperatures vary. The socks are multilayer, with moisture controlling Coolmax and thermally efficient natural merino wool, able to adapt to changing conditions with ample ventilation and insulation and designed to dry fast overnight without absorbing sweat and smell. The Ukko sock has a level 4 thermal grade. The leg shaft is thinner, with a semi-ribbed knit. The foot section has a seamless toe, merino-based, insulating and cushioning terry loop padded sole, plus a fitted heel and elastane grip in the arch for good mid-foot support and helps keep the sock in place. All UphillSport socks incorporating merino wool come from mulesing free farming sources.