I bought a pair each of these for myself & my son. I wear a size 10 1/2 glove, and these fit fine with room to spare. My son prefers to wear these with a pair of windproof over-mitts which he claims has kept him warm the high winds at 10 degrees here in Wisconsin. I wear them with a pair of wool liner gloves (plenty of room for these to fit) & have warm hands in the same conditions.

The outer shell is a very heavy 85% wool and 15% nylon. I believe that the deciding factor in this mittens ability to provide exceptional warmth is the inner liner which a terry-looped construct of 67% acrylic (for moisture wicking), 23% wool and 10% nylon. While not windproof, cold, windy conditions can be minimized by using one of the techniques mentioned above. The looped liner aids in providing warmth, blocking wind, and helps keep hands dry and warmer by wicking away perspiration.

Another advantage over most mittens is the long cuff that extends well onto the forearm, further than most regular gloves do and as far as even the best wool liner gloves. I have yet to find an unheated glove that keeps my hands warm over an extended period of time, but these keep me warmer longer (with my liners) than any other mitts that use hot packs or are battery-heated. (The roominess of the gloves, though, will certainly accommodate chemical hand-warmers.)

As with other Fox River wool products, these are sturdily constructed (now in Haiti) and, based on my experience with this brand, I expect that they will provide many years of service. Plan on washing these by hand and letting them air-dry. A definite value purchase.