Rogz Alpinist Everest dog collar - XLarge : 17-29" x 1,0" (43-70 cm), Rogz Dog collar Sizes: Small - Kilimanjaro : 8 -13" x 0,5" (20-30 cm ) Medium - Matterhorn : 10-16" x 0,6" (26-38 cm) Large - K2 : 13-22" x 0,8" (34-54 cm) / RogLoc XLarge - Everest : 17-29" x 1,0" (43-70 cm) / RogLoc XXL - Big Foot : 20-32" x 1,6" (50-80 cm) for large dogs - Collie, Rottweiler, Mastiff,... Rogz Alpinist Soft Webbing