Adult boa bite? Probably nothing.

The only "snake gloves" I know of are actually hypodermic needle gloves, used in working with hots. They aren't fang-proof though, most of your large-fanged vipers/pit vipers can get through 'em.

THICK, TOUGH leather work gloves from the hardware store are your best bet.. or metal gauntlets

I only use gloves with bitey hatchlings, even though it doesn't really hurt much it does just mentally keep me calm and cut my "flinch" factor.