Dire88 t1_j88ga4r wrote
Reply to comment by i_love_ewe in Fisherman dies after falling through ice on Lake Champlain; state urges caution on lakes this weekend by airhogg
No.
They provide additional boyancy to keep you from going under for a limited period of time (normally about 2hrs). That protects you from the immediate danger (drowning) which gives time to self rescue (using ice picks to crawl out) or be rescued.
You still need to dry off and heat up as soon as possible.
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