SIZE S FOR 46-56 CM CHEST - Measure your dog around the widest part of the chest, just behind the front legs, before ordering. This size is designed for dogs with a chest circumference of 46-56 cm. If your dog is between two sizes, choose the larger size for a more comfortable fit. CUSTOM FIT WITH 6 ADJUSTMENT POINTS - The six-point micro-adjustment system helps the harness adapt to different body shapes, including deep-chested and athletic dogs such as sighthounds, whippets and sporty breeds. CONTROL AND SAFETY ON EVERY WALK - The sturdy back handle helps you support your dog on difficult passages, steps, slopes or road crossings. Reflective details increase visibility during evening walks and in low-light conditions. PADDED ERGONOMIC COMFORT FOR LONG WALKS - Made from durable nylon with soft inner padding, the ERGOTREKKING harness distributes pulling force across the chest instead of the neck. Its ergonomic shape helps reduce pressure points and rubbing during hiking, trekking and daily walks. FULL MEASUREMENTS - Chest 46-56 cm, neck 32-42 cm, under-chest strap 42-52 cm. For best fit, measure the chest at its widest point behind the front legs and check all measurements before purchase.