Last trek we saw some big nasty looking blisters. The key to preventing blisters (according to professional trekkers and hikers (Pres. Ruben and Bro. Ipsen) is to have SOCK LINERS that you wear underneath your socks. So you will wear your sock liners and then a pair of normal/hiking socks over them. You can buy them at Bass Pro Red Head brand 1 pr. for $3.99 and Bro. Ipsen prefers the RedHead CoolMax for $4.99. Or you can even use nylons (half hose) or thin dress socks for boys. It really does make a difference! If anyone else has a good suggestion let us know too! Happy Trekking!!!