keep in mind that long term applications for the socks, not only medical but think deployed military. (old trench foot comes to mind) but if you keep a pair a socks of for weeks without any type of harmful growth, imagine the applications.
Agreed TYAZ price point is key here. I wanna see our pairs @ roughly 5.00$ each in time or less. But for the first shipment. 19.99$ for 3 pairs is competitive. Gotta learn to walk before we run!