The double D-rings also help to bear the pull and force from your dog. The collar is finished with reflective webbing stitched in for increased visibility when walking your fury friend in darker conditions. Stainless steel double D-Rings - attach your lead to both rings for high strength and extra securityMade from proprietary soft touch webbing - super soft, comfortable and durable Double D rings take pressure away from easy access buckle Reflective stitching - for increased visibility at night Accessory D ring for attaching ID tags etcSize: MediumSizeNeck (cm)Webbing Width (cm)S22-291.2M29-401.9L39-592.5XL47-713.8For best fit, measure the neck of your dog. Fitted correctly, the collar should be snug on the dog and not too tight.