Size/Fit Summary: True to size, Slim fit. If you are in-between sizes or want to wear a thick sock, it is recommended to size up. The FSC-certified Commando Chelsea Boot was crafted using natural rubber from forests independently audited to Forest Stewardship Council standards. These 100% waterproof boots are handcrafted to strict standards to protect forests, as well as the animals and communities that depend on them. Crafted from natural FSC-certified, vegan rubber, the 100% waterproof Commando Chelsea Boot is a new addition to our iconic Original collection. Retaining all the beloved features of the Original black Chelsea Boot, like the flexible gusset and Hunter grip, this new silhouette has a higher profile, reaching 15mm 0.59 further up the leg. This style also features an updated recycled polyester lining and insole.