From: Tac-Life.com

Hornady Critical Defense

Conventional hollow points have always had issues with the cavity becoming clogged with fibers from clothing, rendering them ineffective in terms of expansion in soft tissue after they encounter the clothing barrier. But Hornady’s Critical Defense cartridge plugs this with their closely-guarded rubber material making for a clean penetration and predictable expansion with every shot.

As of 10-May-2010 available at Cabelas.
http://www.cabelas.com/p-0066032216932a.shtml