hand-dyed leather mittens with eco-insulation . the jbmc blutrot sz gloves are hand-dyed mittens made of vintage leather. recycled thermolite-eco insulation keeps you warm, while the bonded leather palm provides grip on grabs. recycled materials, soft microfleece lining and the waterproof and breathable dryb® membrane, make the blutrot sz mittens a must-have for this winter.