Check out these expedition mitts designed for 8,000 m peaks and arctic expeditions! They are Alti-Mitts by Outdoor Research. The following is Outdoor Research‘s description from their website: "These altitude-oriented mitts provide warmth while keeping weight and bulk to a minimum. The waterproof shells have thick fleece on the palms and synthetic insulation on the backs and the removable liners have the same fleece and loft combination. The fleece provides crush resistant warmth and a secure grip, while the synthetic insulation offers compressible warmth. Leather palms give you a solid connection with your gear in all conditions."
They are brand new, size small. The price is significantly discounted.