The Equation range features our most advanced insulating technologies to keep you warm. Equation wetsuits are made with the latest Eicoprene technology, a non-petroleum based synthetic foam derived from a mix of oyster shell powder, limestone, and recycled tires. To laminate the recycled polyester lining we use Aqua-A, a solvent-free water-based glue with no harmful chemicals. The Equation 4/3 Front Zip version is designed for sessions in chilly water (52 degreesF-63 degreesF). The WPF lining (Warmth Performance), our warmest lining available, makes this wetsuit stand out. The 3D-Knit construction and the WPF lining provide warmth by trapping air between each loop. The denser fabric offers extra comfort. Its front zip and watertight seals minimize water entry. Comfort zones protect your ribs when paddling. It also features glued, blind-stitched, fully-taped seams (GBS), which provide protection, stretch, and water resistance.