For the rancher, farmer, or horse lover As Muck turns 20, we honour its farm and agriculture roots with a refined version of a classic favourite. Stirrup-ready, the Derby is designed for the rancher, farmer, or horse lover who spends days working on the farm or in the barn. This pull-on Chelsea is stylish enough to wear into town, but with durable and protective features designed for equestrian and on-the-farm life. A slim-last and breasted heel safely fit both Western and English style stirrups. 100% Waterproof Slip-on chelsea style 3mm CR Flex-Foam neoprene liner is 100% waterproof with exceptional comfort, flexibility, shock absorption and heat retention properties; adjusts to the contours of your foot to resist blisters and chafing 3mm built-In footbed for underfoot comfort Steel shank for structural support Stirrup friendly heel SRA rated slip resistance Estimated height: 17cm/ 6.7" Estimated max calf circumference: 29cm/ 11.4" Comfort Range: Sub Freezing to 18°C