Hi! My kids are doing a beach safety course over the summer, along with two surfing camps. I was going to get wetsuits for them, as they will be surfing when we go away for weekends also. The shop etwe visited recommended a 5m wet suit for e120. They said we could get the cheaper 3mm wetsuit for e65, but they would only apparently do for summer, but they will only really be going surfing/beach safety from April to October. Are these wetsuits suitable for swimming in the sea also? Would welcome some advice/comments before I fork out.