I only have one leather, a Utilikilts brown. Its heavy, think they said its made out of the same leather as baseball mitts.

Have worn it outdoors a lot in cold weather, windy rain, snow, and its kept me quite warm. Maybe a heavier leather that's able to hold some heat. I notice its very warm when I take it off.

Have a saffron leather RKilt in the works. The leather swatch seems just a bit thinner than the UK kilt leather, but that's okay by me for Arizona summer heat.

Ron