Sipping is cutting small grooves across the tread to improvement contact with the road giving better traction. Michelin LTXs are sipped nicely and they go through the entire usuable tread. Here's a couple of links about sipping:
http://www.4x4wire.com/toyota/tech/sipe/
http://4crawler.cruiserpages.com/4x4/CheapTricks/TireSiping.shtml#HowToDoIt
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