People pick their onboard treads for looks, comfort, brand allegiance, or any other reason under the sun. But when you take a walk on the wet side, does your shoe of choice help you stay on your feet? We went in search of an answer by using a device capable of testing the traction of footwear on both wet and dry surfaces. We picked the three most popular types of boat shoes and sacrificed them in the name of science. To test the shoes, we visited Design Research Engineering, a Novi, Michigan-based company that owns the Slipmeter. Designed by a physics geek (that's a term of endearment around here) and using a motion that replicates ankle and heel impact, the CO2-powered apparatus presses a quarter-size cutout of the sole against a wet or dry surface. The traction - or lack thereof - is then measured on a scale of 0 to 1. With an inert rubberlike material called Neolite to provide a baseline, the range goes from an extremely slippery 0.1 (wet gel coat) to a downright sticky 1.0 (dry carpet). In factories, supermarkets, and other work areas, 0.5 is the standard for safe flooring. Using the Slipmeter, we tested how different shoes fared on molded nonslip. (We also padded around on the nonslip sole of a Sea Ray - both dry and doused with water - while underway.) Here are our test results.