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.