Product Features 'Premium Officially Licensed Jersey 'Official Team Logos and Colors 'Rib knit edging throughout 'Dazzle Knit fabric used on shoulders, sleeves, neck line, and upper back. 'Dazzle Knit makes these jerseys look and feel like authentic game day jerseys...but for your pet! '100% Polyester, machine washable Product Description New York Mets MLB Pet Jersey features authentic style dazzle knit jersey material. Take me out to the ballgame, WOOF! -------------------------------------------------------------------------------- SIZING This dog jersey uses three measurements, L (LENGTH FROM NECK TO BASE OF TAIL), and G (GIRTH AROUND CHEST), and N (SIZE AROUND THE NECK). The most important measurements are the GIRTH and NECK. NOTE: These jerseys run small. We provide the manufacturer supplied measurements here. However, if your dog is at or above the middle of either the Neck or Girth measurement, we strongly suggest ordering up one size. X-SMALL: L:6-9", G:15-17", N:6-8.5";, N:10-13" SMALL: L:8-12", G:18-20", N:8-10" MEDIUM: L:14-18", G:20-23", N:10-12.5" LARGE: L:18-20", G:23-25, N:12.5-14