A crucial part of any cold weather outfit the icebreaker mens oasis long sleeve half zip baselayer uses lightweight merino fabric to provide essential warmth without overheating naturally odour resistant and highly breathable this baselayer allows you to regulate your body temperature using the simple zip designactivityrunning walking hiking snowsportscolour swatchgreyflat locked seamsyesgendermensperformancebreathable lightweightsleeve detailslong sleevebrandicebreakercolourg