When you walk off the trail and enjoy the wilderness scenery with your dog, GOTO2 harnesses are the choice. When the weather changes and you both wear protective clothing, GOTO2 is the choice. MATERIALS Regenerated polyamide from fishing nets Regenerated polyester from plastic bottles Inside ECO foam Accessories ocean waste recycled plastic Products containing SEAQUAL® YARN. FUNCTIONSpecially designed for dogs who love running. SIZE chart - the most important is to measure that the harness fits the neck (A) and chest (B). BREEDS SIZE example XS: Jack Russell, Parson, Sheltie, Border Terrier S: Parson M: Spanish Water Dog, Border Collie L: Dobermann. Size Neck (A) Chest (B) XS 25 - 38 cm 36 - 43 cm S 31 - 50 cm 43 - 56 cm M 43 - 55 cm 56 - 74 cm L 53 - 75 cm 72 - 90 cm XL 68 - 89 cm 80 - 100 cm.