Material: cotton Size Cervical Wearing Length Waist Small 16cm / 6.3 -22cm / 8.66 13cm / 5.12 25cm / 9.84 -31cm / 12.2 Large 19CM / 7.48 -30CM / 11.81 19CM / 7.48 25cm / 9.84 -40cm / 15.75 Product Features 1 flexible cloth sweat breathe soft warm not easy to start very comfortable 2 there is a button to adjust the size apply to the vast majority of guinea pigs and young rabits 3 three-dimensional cropping is suitable for cat dogs making pets more skin-fitting Package Include: 1 x Pet chest strap Notes: 1. Please allow 1-3 cm difference due to manual measurement and 3-5 g for the difference between different colors. 2. Due to the screen difference the color may be a little different from what you expect please allow it. 3. 1.00cm=0.39