I think there are only two main styles for the Ergo -- regular or the sport. The sport one is slightly cheaper and supposedly it is made of more breathable material (not all cotton) and the regular one is made of 100% cotton. I think both models are fine, it is a personal preference. If you are worried about the heat, the sport model may be better. There is no need to buy the organic cotton one, unless you have a color preference or prefer organic cotton.
Wiki, seems that you have used enough carriers to open a baby carrier shop!
啊哈,这回看清superdaddy什么样了,wiki好福气!