Thank you for your interest in Huawei wearables. The composite vegan leather strap of the HUAWEI WATCH GT 5 Series is natural calfskin wrapped around with vegan leather. The leather strap of its predecessor is all made of natural calfskin. Vegan leather is warm to the touch, skin-friendly, and fingerprint-proof, and therefore the composite vegan leather strap offers greater resistance to stain, dirt, and daily wear-and-tear. Thank you for your interest and support.