It's important to get a product that has good opacity and durability. Make sure the adhesive is formulated for your type of jersey...there are some materials specifically made for tricot, micro and other types of mesh jerseys. Teflon pad protectors are great to use especially for this application, it protects the lower platen when you are applying your numbers to the flip side of the jersey. Also make sure to use a teflon sheet or teflon pillow inside so your application doesn't affect the backside of the jersey. Hope this helps!