evo.com | Ignik Outdoors Hand Warmers > The Ignik Outdoors 24-Hour XL Warmers provide a big ol' patch of warmth for as long as you can hang. That's four full days of controllable and biodegradable warmth that can be recycled after you're done with it. Re-Usable Temperature Regulation Envelope Lets you Control your Tempurature 98% Biodegradable Contents can be recycled after use. Materials Iron, Vermiculite, Salt, other materials Dimensions 4 x 5 in | 10 x 12.7 cm Patent-Pending Temperature Regulation Envelope | Ignik Outdoors 24-Hour X-Large Warmers 4 Pack 2026 - 4 Pairs