The Black Diamond Mercury Mitt is a popular choice for year-round use and combines a BD

One piece collar

this protective bib keeps you warm and allows you to dump heat when necessary with side vent zippers

Antimicrobial

Helly Hansen Lifa Merino Midweight Crew Long Sleeve The Black Diamond Mercury MittThe versatile LIFA Merino Midweight Crew Base Layer adapts to any type of cold weather. We combined a 100% merino wool layer with our proven LIFA Stay Warm Technology in a fitted 2 layer construction. LIFA Merino Midweight Crew Base Layer delivers all the breathable warmth of merino wool fibers, plus the unique moisture management properties of LIFA fibers. LIFA MERINO 2 layer construction 100% Merino wool exterior Flat lock seams for ideal comfort