What kind of clay is this?

[BelfastSmile]

DS brought this packet of clay home from school. I'm not sure whether it's air-dry, or needs to be oven baked or whatever.

Anyone recognise the packaging and know what type it is?

Looks like a air drying foam clay to me. Polymer is usually in far smaller packets and is quite expensive compared to air dry.

Thanks! It does feel sort of "foamy".