Size:XL for 12.0~18.0 lbs Please measure your pet’s size before payment,Your baby usually wears size S,but it doesn’t mean all size S will fit him/her.If any of the measurements are between two sizes, choose the larger size.Detail Name: Christmas Santa Claus Costume with Cap Condition: 100% brand new and high quality Material: Soft Coral Fleece Type: Coat Gentle: Unisex (Female & Male) Colour: Black Seasons: Spring / Autumn / WinterHow to measure pet’s size:1.Measure length of Pet’s back form the base of the neck to the base of the tail (Length).2.Measure neck circumference if necessary.3.Measure the broadest part of the chest (Girth) all the way around (usually just behind the front legs).Size: S, M, L, XL Size S: Chest Girth: 13.3″, Back Length: 9.1″, Neck Girt: 9.4″; recommend for 3.0~5.5 lbsSize M: Chest Girth: 15.7″, Back Length: 10.6″, Neck Girt: 11.0″;recommend for 5.5~8.0 lbs Size L: Chest Girth: 17.7″, Back Length: 12.2″, Neck Girt: 12.6″;recommend for 9.0~12.0 lbs Size XL: Chest Girth: 19.6″, Back Length: 13.8″, Neck Girt: 14.2″.recommend for 12.0~18.0 lbs Note: Kindly please check the size details clearly in following description informations before making an order. We appreciate it. About our services 1.If you are satisfied with our products, please don’t forget to leave 5 stars Positive Feedback, we will appreciate your encourage.2.If you are not satisfied, before you leave the Negative/Neutral feedback, contact us and let me know that, we will resolve the problem till you satisfy.