Eagle Industries has been around for a long time and that's for good reason. 

The Eagle Industries Hand Warmer Sleeve is a fleece-lined handwarmer with waist strap and expansion compartment made of Tweave 520E material. Available in black, orange, Multicam, and coyote brown, the hand warmer sleeve has elastic cuffs for fit and comfort, an expandable bottom, and side-release buckle for easy donning and doffing.