It’s not just a cooler, It’s a COOLER cooler. Designed with TRU® Zip technology, the CORE Performance Series Soft Coolers stand out among the best in the industry. The patented TRU® Zip zipper is fully waterproof, dustproof, airtight, and submersible (IP67). Our trademarked cooling technology comprised of high-density EVA foam, heat-repelling mylar film, and heavy TPU waterproof lining, ensures your cooler will keep its contents cold. Combine that with a rugged abrasion-resistant shell and leakproof guarantee, and it’ll keep keeping things cold for years to come.