As with SeaDek, I traction-tested the untreated teak plank both with and across the grain. In testing with the shoe placed parallel to the grain, teak lives up to its old-school reputation for grip. It offered better traction than both types of the fiberglass textures in my comparison. However, with a damp deck, you can’t count on the same grip. Still, even when wet, teak offers the same degree of traction as either fiberglass nonskid.