Ruffwear’s Web Reaction Collar is a martingale collar with reflective Tubelok webbing and a side-release buckle for easy on/off. The martingale is a popular solution for dogs that can slip out of traditional collars. The collar is available in sizes 11-14 in., 14-17 in., 17-20 in., 20-23 in. and 23-26 in. Colors include granite gray, blue dusk, seafoam and sunset.