Minnesota Twins dog jersey is v neck design and made of a micro mesh polyester with velcro closure with button trim. The large is for 16 to 17 inches back length measured from base of neck to base of tail, 20 to 24 inch chest size measured across the back and around the dog behind the front legs, neck 13 to 16 inches, and not weighing over 30 pounds. This item will have either number 00 or number 01, and is not selectable. When measuring for proper fit, consider your pet's build, thickness of hair or fur, and growth potential. This item is submitted for production when ordered; please allow up to 14 days for it to ship out.