Note the back strap is only smaller sizes,
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This review is from: Reef Kids Ahi Flip And Thong Sandal (Shoes)
We ordered the 'Monster Surf' style (10/11 UK) for 4year old expecting the back strap to be included (as per photo). However we discovered afterwards the larger sizes dont include the strap.
Turns out he didnt need it. No problems walking long distances. He was really happy with them despite been quite fussy with foot-ware. Experience has shown us that it well worth spending the extras on reefs for adults or children. The fit and comfort seem to be on a different level to the other brands.