The 1. 5mm Flatlock Wetsuit Jacket is built for tropical water sessions when the air bites but the water doesn't demand full coverage. Flatlock stitching sits flush against the skin so long paddles out don't turn into chafed shoulders, and the lower collared design stays comfortable without flushing cold water down the back. Performance patterning keeps the fit close through the torso and arms, tracking a paddling stroke instead of bunching against it. What Our Gearhead(R) Experts Are Saying:At the lineup, the lower collar is what I notice most: sealed against my neck even after a long set, with zero flush down the back on a duck dive. That's the detail that sold me on this jacket over others I've tried in warm water.