The Ruffwear Grip Trex dog boots set the standard in paw wear for dogs who hike, bike, run, or explore the great outdoors with their humans. These high-performance boots feature a rugged and resilient Ruffwear-designed Vibram outsole that provides exceptional traction on varied terrain. Breathable mesh on the upper part of the shoe provides ventilation and keeps dirt and debris out. The closure system combines hook-and-loop with hardware, cinching around the narrowest part of the dog's leg to provide a secure fit. Just as you would with your gear, check closure system and adjust fit as needed 15 minutes into your activity and throughout the adventure. Grip Trex Boots are offered in sets of two or four and come in 8 sizes. Select the correct size based on your dog's paw width. Measure across the widest part of the dog's paw when bearing weight. For in between sizes, choose the smallest size. Washing instructions: Secure fasteners; wash in cold water on a gentle cycle with mild detergent; air dry.