| Whose | 3M |
| What it is | Thin microfiber synthetic insulation |
| Key trait | Warmth without bulk; warm when damp |
| Used in | Gloves, hats, boots, winter jackets |
Thinsulate is 3M’s brand of thin, lightweight synthetic insulation made from very fine microfibers that trap air in a small space, delivering warmth without much bulk. It retains warmth when damp and is widely used where slimness matters — gloves, hats, boots, and casual winter jackets — rated by gram weight (e.g., 100g, 200g) for warmth.
Thin and warm
A synthetic insulation built for warmth without loft/bulk, common where a thick down layer won’t fit.
Frequently asked questions
What is Thinsulate?
Thinsulate is a synthetic insulation made by 3M from extremely fine microfibers. Because the fibers are so thin, they trap air efficiently in a thin layer, providing warmth without the bulk of thicker insulation. It also keeps much of its warmth when damp, making it practical for cold, wet conditions.
Where is Thinsulate used?
It's especially common where low bulk matters: gloves and mittens, hats, winter boots, and casual or work winter jackets. Its slim profile lets gloves stay dexterous and boots stay non-clunky while remaining warm, which is why it dominates accessory and footwear insulation.
What do Thinsulate gram numbers mean?
Thinsulate is often rated by grams per square meter (e.g., 100g, 200g, 400g): higher numbers mean more insulation and warmth, but also more bulk. Lower weights (40–100g) suit active use and milder cold; higher weights (200g+) suit static use in deep cold, such as winter boots.
Sources
- Thinsulate insulation — 3M
- Insulation types — The Mountaineers