Ahead Armor Cases begin with their unique shape. Featuring Revolution s patented TruForm design, the shape of each case corresponds to the true shape of the drum plus its mounting hardware. The universal teardrop design allows for a much snugger drum fit. The patented DynaZip zipping system makes it easier to take the drums in and out of the cases by combining an ingenious cutaway design with a zipper that travels along the diameter of the case as well as down both sides of the cutout. The Armor Cases incorporate AHEAD s exclusive DX-Core . The drum-hugging DX-Core provides the security of two layers of high-impact foam padding plus the softness of premium-grade Sherpa Fleece lining. This significantly increases both the shock-absorption of the bags and the protection of the drums. The plush interior is complemented by the strength and durability of a virtually indestructible, weather-resistant, water-proof, double-stitched, 600-denier, polyester fabric exterior.