Polarmax base layer is top quality, high performance, quick-drying, lightweight, warm...and best of all it's made-in-USA. We've worked with Polarmax for years, and their product outperforms anything else in the category: Acclimate fabric provides longevity, great fit, anti-microbial, inherent stretch for freedom of movement, and it works. Tech-waffle pattern provides enhanced insulation without bulk, and high breathability. Start your winter adventures right from the inside-out, with Polarmax base layer from R.U. Outside.