Hellobee Boards

I don't know about the general question of sizing up vs. down, but Saltwaters tend to run pretty big so I'd probably get a 6 in those. Jack's in a 5.5 right now and his natives for the spring/summer are a 6, but I'm guessing he may need a second pair toward the end of the summer.

Size up. Also might take into consideration how long they have been in that size. LO1 stayed in a size 6 for a month. LO2 has been in a size 6 for the past 6 months. I would hope a size 7 fits by summer, but he might still be in a 6 at this rate.

Usually I like to size up, but depends on the shoe. Those brands run big IMO tho. I just got my DD some Saltwaters off the classifieds. The 5s fit her a little big and she's wearing 6s in other shoes. natives also run a little big. I tried to size up for those last summer for DS and the size up was just way too big so I returned and got his regular size.

Maybe buy on Amazon both sizes and return one or return both and look for used in the size you need.