i've gone sans vest under my Boost for years, but the past two seasons started wearing one. I figure it'd be my luck I'll have a killer spill in 40 degree water, the suit will tear or fill and I'll be SOL. That, plus water po-po have started to keep an eye on people taking their drysuits off around here. That being said, you can keep as much air locked in the suit as you'd like which will provide PLENTY of buoyancy without a vest.
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