I have found a UK online store, Surf Spot, that offers the
powder-coloured Gravis Carlton:
Scroll down about 1/3 of the page to find the shoe. Choose UK size 10,
which equals US size 11.
Surf Spot delivers worldwide upon request. Please contact them for
details on shipping to Canada or the USA:
6 Belle Vue
Phone: +44 (0) 1288 352875
Alternatively, the German online store CHB-Boardshop does offer this
particular shoe, too:
You will note that it is not specified whether the sizes are US or UK.
Judging from the range of sizes, it seems likely that US sizes are
listed. Even if UK sizes are used, US size 11 would be among them
since that would be UK size 10, which appears in the list.
CHB-Boardshop delivers worldwide, if desired. For details about
shipping and the sizes, please inquire with them and don't hesitate to
write in English:
Cool House Boarding
Prenzlauer Allee 208
Phone: +49 (0) 30 / 441 11 11