MATERIALS: The biggest feature of this product is the use of deerskin Suede material, breathable and warm, odorless, environmentally friendly and usable, and can effectively solve the damage caused by inferior polyster materials dogharness to your dogs'skin. COMPOSITION: harness set are included : one vest unit + leash ,to save you more time and cost to find the suitable leash to fit our vest harness. NO PULL & NO CHOKE:Soft, gentle, breathable Suede fabrics ,ECO-Friendly . Strong full body collar during walking, running, and hiking. Soft and extremely breathable light weight airflow for an enjoyable walking experience. SIZE: VERY IMPORTANT TO MEASURE BEFORE YOUR BUY- Correct measurements ensure a no slip and no choke perfect fit pet harness set. Our pet vests are designed to prevent escape,please Refer to our dimension chart to choose the best harness for your dogs. XS: Bust 28-33cm/ 17.91"---Neck 19.1cm/ 7.5"---Leash Length 150cm/ 59.1"--- Advise weight range 1.5-3kg/ 3.3-6.6lb S: Bust 34-39cm/ 18.50"---Neck 24.9cm/ 9.8"---Leash Length 150cm/ 59.1"--- Advise weight range 3-4.5kg/ 6.6-9.9lb M: Bust 40-44cm/ 19.09"---Neck 31.8cm/ 12.5"---Leash Length 150cm/ 59.1"--- Advise weight range 4.5-9kg/ 9.9-19.8lb L: Bust 45-51cm/ 19.69"---Neck 35.6cm/ 14.0"---Leash Length 150cm/ 59.1"--- Advise weight range 9-10kg/ 19.8-22.05lb XL: Bust 52-56cm/ 20.47"---Neck 40cm/ 15.7"---Leash Length 150cm/ 59.1"--- Advise weight range 10-11.5kg/ 22.05-25.4lb