I purchased size 37.5 EU. I am size 6.5 US/AU and they were true to size. For me, these boots required 3 weeks breaking in time. They were more comfortable wearing with thick socks instead of thin socks. I have flat feet so these boot were rather uncomfortable during the break-in period. They also felt better walking on tracks/ trails than on concrete. The waterproofing is good and they are very stable. Very good value for money. To get these in Australia would cost double the price.