Overview \nEngineered to give your Apple Watch a modern and robust look for everyday use or your next adventure. The rugged strap is made of FKM, a soft yet strong fluoroelastomer that combines all-day comfort with long-lasting durability. Custom-injected stainless steel hardware provides a secure fit and unique style. \nHighlights \nFKM Fluoroelastomer Rubber \nBreathable Ribbed Design \nFully Waterproof \nCustom Stainless Steel Lugs and Buckle \nDesigned for Apple Watch Ultra/Ultra 2, Series 9, 8, 7, 6, SE and all previous versions of the Apple Watch \nSpecifications \nMaterials \nVulcanized FKM Rubber \n316 Stainless Steel Hardware \nPVD Treatment for Black Color \nFeatures \nWaterproof \nResists lateral slip force of 5-20 kgf during installation in Apple Watch \nDevices \nCompatible with Apple Watch 49mm, 45mm, 44mm and 42mm (Series 1-9, SE, and Ultra/Ultra 2) \nFits most wrist sizes, designed for wrists 150mm to 210mm \n77mm (buckle side) and 120mm (adjustable side) length \nCompatibilities \nApple Watch 45mm, Apple Watch 49mm, Apple Watch 42mm, Apple Watch 44mm