Intended to assist pets in rehabilitation, elderly pets, disabled pets, pets with arthritis,joint issues, injured pets or owners who require assistance to lift or guide their pets with ease. This Waist Support Pet Mobility Lift Harness will help and provide additional support to your pet's back end to help ease their effort when walking, climbing stairs. or in and out of vehicles. The long adjustable support handle will provide a support range of 19.68"-39.37" (50-100 cm). Optional Long Shoulder Strap ONLY for Pet Mobility Lift Harness available for purchase but sold separately.Product is not intended to heal, cure or prevent health issues and are not meant to replace rehabilitation. Please check with your vet or rehab center for recommendation if in doubt. Not suitable for all pets / conditions. MATERIAL: polyester + mesh SIZE:Length are measured from neck to tail; Chest Sizes are measured right behind front legs all around the chest circumference:Small - Waist: 17.72 to 20.86" (45 to 53 cm), Suggested Weight:16.5-27.5 lbs (7.5-12.5 kg)Medium - Waist: 20.86 to 24" (53 to 61 cm), Suggested Weight:27.5-44 lbs (12.5-20 kg)Large - Waist: 24 to 27.17" (61 to 69 cm), Suggested Weight:44-66 lbs (20-30 kg)Extra Large - Waist: 27.17 to 31.10" (69 to 79 cm), Suggested Weight:66-88 lbs (30-40 kg)Note: Please measure the maximum width of the waist and leave 0.5" - 1" room to spare. Please choose the larger size if your pet is between 2 sizes. COLOR:Orange plaidBlue plaid