SAVE THE SHEEP, the new line in techno sheepskin, is cruelty free. The lining is a man-made fabric, which is free from any animal derivatives.The techno sheepskin offers numerous advantages:Can be washed easily and dries quickly, while real lambskin requires considerable, lengthy maintenanceTrapped sand comes out easily out of the loose, soft wide knit, minimizing the risk of abrasions to the legIs more comfortable and a cozier fit than natural lambskinStays looking good for longer, while real lambskin tends to dry out, become stiff and turn yellowThe STS Safety Bell Boots feature highly durable tear resistant Nu-Leather which is waterproof and breathable, with easy to clean Techno Sheepskin cuff and AEROX breathable neoprene lining.Outer Shell: Nu-LeatherCuff Lining: Techno SheepskinCore: AEROX NeopreneClosure: Double Velcro