The Heat Exchanger Balaclava is made with high-performance 320 g fleece and it's designed to be worn with safety goggles. The technology of the heat exchanger captures heat from each exhaled breath and brings the heat back to the body's core, helping to prevent loss of body heat. Winter Gear from Klein Tools provides ultimate warmth options so you can focus on getting the job done.Features Designed to be worn with safety goggles Balaclava is made with high-performance 320g fleece for cold weather Machine washable Removable Heat Exchanger, High-Visibility Yellow Piping Heat exchanger is removable for versatility and adjusts with hook and loop attachment for a form-fit Built-in aluminum nose piece allows for snug fit every time The technology of the heat exchanger captures heat from each exhaled breath and brings the heat back to the body's core, helping to prevent loss of body heat Controls moisture to keep skin dry One size fits most Size: One Size Fits Most Material: 79% Polyester, 13% Polyethylene, 7% Polyurethane, 1% Spandex Machine Washable: Yes Color: Black with High-Visibility Yellow Trim Height: 3 in Width: 8.25 in Depth: 12.25 in Overall Length: 17 in Overall Height: 0.5 in Overall Width: 11.25 in Weight: 0.23 lbs Application: Heat Retention Type: Heat Exchanger Balaclava Country of Origin: Indonesia Covers: Head, Neck, Mouth Style: Balaclava Removable Heat Exchanger: Yes DownloadsVideo DownloadSpec Sheet