total have 4 different sizes for choice,breathable comfort,decompression and shock resistance,elastic back cushion,soft and will not constricting the shoulder,neck elastic design,you can adjust according to the pet's neck circumference without strangulation,double care built in safety buckle,you can buckle it on your pet collar when you go out,one more guarantee to prevent pets from breaking free,custom logo is welcomed and for further information or search for similar products, please contact with our info center.