Helly Hansen Workwear Bifrost Wntr Tall Boa O6 HtOur pinnacle performance winter boots, Bifrost Winter Tall BOA O6 HT, are designed to excel in the coldest and harshest conditions, featuring innovative technologies for maximum warmth and protection to keep you comfortable and safe in any environment. The Dri Blaze Lining, combined with the Helly Tech Waterproof Membrane, ensures your feet stay warm and dry, while the molded TPU heel overlay and toe bumper provide added durability and protection.