What I wrote before about Christophe toe clips, is certainly not the case for their toe straps. Christophe straps (and many others, maybe from the same factory) simply didn't work well. I've always used Alfredo Binda straps. Christophe may be fine for kid bikes, touring, fixing spare tubulars underneath a saddle or a bike on a bike rack, but not to race with.
Anyway, the straps are nice enough for a vintage bike and always better than nameless nylon straps or other crap that is sold nowadays.