The Men's Smartwool Merino 250 Baselayer Crew is a tried and true layering piece that has been updated to improve functionality and aesthetics. An interlock 100% merino wool knit offers comfort, breathability, thermoregulation and odor resistance. Shoulder panels eliminate top shoulder seams while the flatrock seam construction minimizes chaffing while wearing the Merino 250 Baselayer Crew. 100% Merino Wool, Interlock Knit - Enhanced Comfort, Breathability, Thermoregulation, Odor Resistance, Updated Fit - Improved Functionality + Aesthetics, Slim Fit, Shoulder Panels - Eliminate Top Shoulder Seams, Flatrock Seam Construction - Minimizes Chaffing, Fit: Tight, Material: Wool/Synthetic Blend, Weight: Light, Type: Top, Recommended Use: Snow, Model Year: 2022, Product ID: 915192, Model Number: SW016349545-M, GTIN: 0195436089818