The World's First Insulated Knit Sock, featuring patented Aeris 250 ½" insulation. Updated Features: ✅ Knit Ankle Cuff – Easy on & off convenience ✅ Brushed Liner – Enhanced comfort around the foot ✅ Improved Design – Maximum fit & support ✅ AERIS 250 Insulation – Keeps feet warm & dry ✅ Moisture-Wicking – Breathable and sweat-resistant Men's Sizing: 🧦 S: 6-7 M: 7-9 L: 9-11.5 XL: 11.5-13 Women's Sizing: 🧦 S: 8-9.5 M: 9.5-10 L: 10-13 Pro Tips for Ultimate Warmth: Keep your core warm with our BasePro or Jacket for full-body heat retention. Stay hydrated to help regulate body temperature and maximize your comfort. For the best performance from our socks , we recommend pairing them with our BasePro layers or jackets to maximize warmth . We're also updating our online info to emphasize that keeping your core warm first is the key to preventing cold hands and feet . PLEASE NOTE: For those with sensitive feet, we recommend wearing a thin wool or Merino non-cotton sock as a first layer under the SockPro . This additional layer will enhance comfort and provide an irritation-free experience, as interior seams may sometimes cause discomfort. "Do NOT Wear near Fire" AERIS INSULATION (Placement Materials: 80% Nylon / 20% Spandex 4 way Stretch Weight 3 oz Dimensions 1 × 2 × 7 in SIZE Small, Medium , Large , X-Large
