the v1 avaliable in plain white (imo the better v1's) or stars or spots design were bamboo or fluffle innered, the bamboo one took much longer to dry, but is still good.
the v2 ~(brights were originally commisioned for the american market) prints are a much softer, almost silky lycra feel to them, better poppers, and the core is half bamboo half microfibre, still pulls out for drying, but dries quicker than the v1 bamboo. still a bit more expensive than most like to pay out, at 17.99 for the prints, but they truly are sposie like for the fit. i have erm a few v2 prints, as well as brights and the v1's and my fav has to be the v2 prints. the resale so far is also good on them as so many people seemt o want them just not at 18 quid a pop. so u could buy a few and sell them on for a good amount i'd say