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TOE-IN Toe-in is the angle of the side fin relative to the stringer, i.e. the front of the fin is closer to the stringer than the rear of the fin. A single fin (and the center fin of a thruster) has no toe-in, as the stringer and fin are pointed dead ahead. Some (but not all) side fins have toe-in. E.g. A traditional fish has no toe-in because the fins are parallel to the stringer. Side fins on thrusters, twinzers, twin fins (other than traditional Fish) and quads are usually toed-in a small amount (1/8 to 1/4 inch, or 0.5 to 0.75 cm)