There seem to be various different sun protection suits about for babies / toddlers, but I'm hoping someone who's actually used one could explain the differences. Jojo catalogue has one mostly nylon which blocks 98% of UVA rays, or one mostly cotton which blocks 92%. I'd prefer cotton but what difference does that 6% make ?! GLTC catalogue has one mad of ? which blocks 80%, so is that sufficient ?, and also one which offers a UV protection factor of 50+. What's the difference between UV factor and blocking UV rays ? Urchin sells one which 'blocks out those harmful rays' - but how many of them ?! And finally Green Baby's offering is polycotton with that 50+ UV protection again. If you weren't confuced I hope you are now. If you have a degree in sun factor-ology, please explain. Many thanks