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When the wielder is damaged by an Ice- or Fire-type attack, damage is reduced by 50%. It has no effect on burn, freeze, or hail damage.
Now that Thick Fat is legal with Superpower and Icicle Crash, Thick Fat has become the ability of choice for Mamoswine, who can use it to remove its Fire-type weakness and grant it an Ice-type resistance. Gaining two resistances at no expense is a big advantage, and so other Pokemon that get it, such as Snorlax, will often use it as their ability of choice. While Snorlax is no longer the force it once was in OU, it is still a greatly potent threat in the lower tiers.
Found in Dream World