Fish Monkey OTC Yeti Series Heavyweight Over The Calf Socks Grey XL. Using a Merino Wool/Acrylic blend and heavy cushion the Yeti will keep your feet warm during those long morning in the tree stand duck blind or frozen lake Minus 30 degrees "Bring it On" Plus a seamless toe prevents chafing These are perfect socks for cold to extreme cold conditions paired with waders heavy leather boots or muck rubber boots. Specifications for Fish Monkey OTC Yeti Series Heavyweight Over The Calf Socks: Manufacturer: Fish Monkey Men's Clothing Size: Extra Large Gender: Male Age Group: Adults Color: Grey Footwear Type: Socks Fabric/Material: 75percent Merino Wool 23percent Nylon 2percent Lycra Condition: New Features of Fish Monkey OTC Yeti Series Heavyweight Over The Calf Socks Heavy Weight for maximum warmth in extreme cold conditions Merino Wool construction for superior performance (OTC) Over the Calf length Wader Friendly Arch and Ankle compression for reduced foot and leg fatigue Plush wool cushioned footbed for maximum warmth and moisture management Nylon reinforcement in high-abrasion areas Y-gore heel prevents slipping and chafing "Seamless" toe construction for enhanced day-long comfort Wool a natural Anti-microbial (no stink) Package Contents: Fish Monkey OTC Yeti Series Heavyweight Over The Calf Socks Fish Monkey SM425-GRY-XL: OTC Yeti Series Heavyweight Over The Calf Socks Grey XL