XSmall = cm. 110-115 withers/tail for Shetland with height at the withers of cm. 120/130 Small = cm. 120-125 withers/tail for ponies with a height at the withers of cm. 135/145 Medium = cm. 130-135 withers/tail for horses with a height at the withers of cm. 150/155 Large = cm. 140-145 withers/tail for horses with a height at the withers of cm. 160/165 XLarge = cm. 150-155 withers/tail for horses with a height at the withers of cm. 170/175 We are available for further clarifications on the product, consultancy and assistance. Safe, fast and free. You have the guarantee of Ebay protection and you can pay with any card associated with your Paypal account. You will find the payment details in the email you will receive at the end of the purchase. To speed things up, write to us to let us know.