It determines the selling price of the product you have reviewed. please complete your order by selecting the correct size option when ordering. s: back 24 cm / head 37 cm / neck 23 cm m: back 28 cm / head 41 cm / neck 26 cm l: back 33 cm / head 46 cm / neck 30 cm xl: back 38 cm / head 55 cm / neck 34 cm 2xl: back 43 cm / head 58 cm / neck 38 cm. the size of each brand is different, please complete your order by considering your dog's size criteria. the size chart is in the photos and description. navy hill harmas montbeden / size: s m l - xl - 2xl ex fabric storage waterproof, Improved version for clearer understanding and better search visibility. Suitable for users seeking detailed and reliable product information.