There are 3 kids on the block.....Scent-Lok/Scent Blocker and Goretex Suppressant. I have done a large amount of research on the scent absorbing suits recently. I am going with Suppressant by W.L. Gore(yes by Goretex). It is supposedly washable, and I was told by a Goretex representative that it is guaranteed to last as long as the garment itself. Unlike Scent Lok and Scent Blocker, the charcoal will not wash out. The "others" effectiveness supposedly will last 3-5 yrs. with moderate use! On a Scent-Lok garment it says to wash once or twice a yr.! That in itself tells me something.