Grip Trex all terrain boots. These were used briefly 2-3 times with our pittie who passed away. They were great for the snow and the socks kept the boots in place. We tried many brands and these worked beautifully! Smoke free home Adjustable Velcro at the top of the boot. Great tread. Sizing: Socks are 2.0"/2.25" (51/57 mm) Boots are 2.0"/ 51 mm Additional photos are from the Ruffwear website explaining how to measure your dog’s paws. We matched the sock sizes to the boot sizes. They recommend if between sizes you size down. On the website the boots sell 2 for $40 ($80 for 4) and the socks for $15.