Three Jacks Dog Bakery Hemp Martingale Collars Image of Hemp Martingale Collars Image of Hemp Martingale Collars Image of Hemp Martingale Collars EarthDog solid martingale collars feature 100% hemp webbing. Available in 5 colors. Hypoallergenic. unlike nylon and other synthetics, hemp softens with wear making these collars extra comfortable for your dog . Machine-washable. All collars are 1" wide Available colors - Tangerine, Blueberry, Brick, Sunflower, and Leaf small: 8"-14" medium: 14"-20"