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Use subliblock for them or use a black underbase first. I do sublimation also. That's easy long as you have a sublimation 13x19 printer or 24"

The dye from the polyester jersey will turn color after a few washes. And cricut vinyl is cheap and not the right vinyl. You need a certain type of vinyl

some of the jerseys are sublimated. but its a process call cut and sew then its sublimated with the design and numbers. the other way is with htv that we use call sublblock to block dye migration. the jersey above. will start to show dye migration its already showing in the name at the top.