Is this snowsuit actually waterproof?

Yes. The listing specifies a waterproof shell, and the snow gaiters add a second barrier at the ankles. It is built for snow play, not heavy rain.

What size should I pick?

This listing is US size 5. Deux par Deux is a Canadian brand, so check the size chart against your child's height rather than age, and leave room for a base layer.

Does it come as a set or one piece?

It is a one-piece snowsuit, not a jacket and pants set. That means full coverage with no gap at the waist, but more effort at bathroom breaks.

Is it warm enough for very cold days?

The fleece lining adds insulation, but the listing gives no temperature rating. For deep cold, pair it with a thermal base layer.

When is the cheapest time to buy it?

Kids' snow gear usually drops after the season ends, in late winter and early spring. Right now only one store lists it new at $278.18 as of November 7, 2026.

That is a premium price for a kids' snowsuit that will fit for a season or two. It makes sense if you need serious waterproofing and warmth for daily snow play.