
The Cardinal CA7839 is the side-zip Cardinal — an 8" waterproof composite-toe boot on barnyard-acid-resistant leather, with a heavy-duty YKK zipper so you never have to unlace it. Key Features of the Carolina CA7839 Heavy-Duty YKK Side Zipper — Lace it once, then zip in and out. Composite Safety Toe Cap — Meets ASTM F2413 for impact (I/75) and compression (C/75), with less cold transfer than steel. Aspen Bruno Barnyard Acid Leather Upper — Treated to resist the acids in manure and fertilizer. Waterproof SCUBALINER™ — Carolina's proprietary waterproof lining system. Mesh Lining — Breathable against the foot. Removable Kiltie — Lifts out for cleaning or a different look. Removable AG8™ PU Dual-Density Foam Footbed — An update to the AG7, with enhanced arch support. EVA Midsole & TPU Heel Stabilizer — Cushioning underfoot, heel roll under control. Electrical Hazard Rated — Tested to withstand up to 18,000 volts at 60Hz for one minute without leakage. Triple-Rib Steel Shank — Holds the boot's shape under heavy load and torque. Cement Construction — A bonded sole that keeps the boot light and flexible underfoot. Oil- & Slip-Resisting Rubber Lug Outsole — Aggressive tread. Why a Side Zipper Lace the boot once to the fit you want, then use the zipper. You get the security of a laced 8" boot with the speed of a pull-on — which matters most to anyone in and out of boots several times a day, or anyone who can't comfortably bend to lace up. The YKK zipper is the heavy-duty version, which is the part that decides how long a side-zip lasts. What Barnyard Acid Resistance Actually Does Manure, urine, and fertilizer are chemically aggressive. They attack ordinary leather, and a boot that shrugs off rain will still come apart in a dairy barn or a feedlot. Acid-resistant leather is treated to withstand that exposure. Support Where a Tall Boot Needs It A triple-rib steel shank spans the arch and keeps the boot rigid under heavy load and torque — on ladder rungs, on a shovel, on uneven
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