What Our Gearhead(R) Experts Are Saying:"I have been wearing the Alpine Crew as my go-to base layer on high-output cold weather days and it manages moisture better than anything synthetic I have tried at this weight. The mesh panel at the center back makes a real difference when the pace picks up and you need to vent without stopping to strip a layer."Cold mornings and hard efforts have a way of testing every layer in your kit, and the one closest to your skin matters most. The Smartwool Alpine Crew is built to be that layer, delivering the natural temperature regulation, moisture management, and odor resistance that only 100% merino wool can provide, from the first steep climb to the long cool-down at the end of the day. A mesh zone at the center back adds targeted breathability right where heat builds fastest during high-output efforts, while four-way stretch and a regular fit give you full freedom of movement without any extra bulk under a shell or mid layer. The ribbed collar sits comfortably at the neck through long days in a helmet and harness, and the natural properties of merino keep the whole system fresh across back-to-back adventures without needing a wash between every wear.