In reply to Gasmerchant:
Nothing specific although I've bought my kids super cheap Lidl winter mitts, gloves and jackets before, when we lived in Finland, and they seemed good value for the low cost. Kids wreck gloves and mitts over a winter just playing in the school playground wearing them, so buying fancy ones seemed silly.
You don't see them much in the UK for obvious reasons, but in countries where people ski a lot there are loads of options for cheap ski helmets. If they have the appropriate ratings (and Lidl wouldn't be able to sell them if they didn't) and fit your head, I'm sure they will do the job just fine. In Finland all the big supermarkets, sports shop chains and even the equivalent of Halfords, sold ski helmets for often around or less than €20, so the Lidl ones are unusual if they are around that price. In the UK Decathlon also do very reasonably priced ones.