The material used by Sugoi is Technifine Mesh. It is the same material Sugoi uses for their retail singlets and the same material used by uniforms like Army (that cool gray camo design). If you have a Sugoi singlet made in the last 3 years, it is likely technifine mesh. The printing method is done by sublimation, not by heat transfer. Sublimated colors do not run and I've never known them to fade. It's a quality product (no, I'm not a distributor... just a customer).
For Wejo to make a decent profit and to cover shipping, he'd probably need to charge at least $25/each... which isn't too shabby since they charge $30 in running stores for the same thing in a solid color.
I've thought about asking Wejo about this before, I guess now is as good a time as any... right after I get back from New Year's vacation.