Is this a sleeper or a onesie?

It is a onesie in a T-shirt cut: short sleeves, one piece, no feet. It is not a footed sleeper.

Can it be worn in cold weather?

On its own it suits warm rooms and summer days. In cold weather it works as a base layer under a cardigan or blanket.

The design shown is a plain pull-on onesie with no snaps or zip visible. Expect to pull it over the head and legs for changes.

The material is not specified. Treat it as a soft knit everyday onesie and check the label for fiber content and washing.

A zip-up sleepsuit is faster for night changes and warmer. This onesie is lighter and simpler, better for daytime and warm weather.

At 500 LEVEL, for $19.99, as of our latest check.

$19.99at 500 LEVELChecked Nov 12

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