Weighs only 30g. Constructed from the most lightweight and comfortable material. It is reusable material that’s washable. It’s thermal insulating properties allows it to retain heat of hot beverages in paper cups. Just that tad more warmth in the cold winter and extends thermal values by over 80%. A cup of 80d hot beverage that’d take 30 minutes to naturally cool to room temperature will take 3 hours instead in this thermal sleeve.