But what's different between that and my ski jacket?

Your ski vest will come apart and off of you at anything past about 55mph.

The lifeline will not. They also have a collar and we'll hold you upright even with the added weight of a helmet,  a ski vest will typically hold you face down with a helmet on. Besides that, the flotation is nearly double that if a ski deal. This holds your head higher out of the water. Think about a full face helmet.

GT

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