Originally Posted by mdf
DIN (German industrial standards, more or less) is the German member of ISO (international standards organization). We call binding standards DINs because they originated them.
ISO 5355 is also DIN 5355.
Apparently DIN 7880 has been withdrawn, replaced by 5355. I have no idea if they are really different,or if it was done to make the id number match iso.
I do notice that 7880 was last revised in 1984 with the previous rev in 1977. Plastic boots became common in the 1970s, so I suspect the standards really are different.
(The binding settings standard is DIN 7881, published in 1982 and revised in 2008.)
in answer to the OP's query.
ISO 5355 is the latest std used and takes earlier DIN 7880 and sole dimensions as applies to binding/boot/ walking contact interface, into the ISO and adds additional standards as to material properties, 'hardness', compliance testing parameters and the proper application of the Mondo point sizing system, .
rental shops not working with 7880 boots is their decision, of course
on a practical side, a 14+ old boot (given the boot was used for some time prior to the 14 yr lay-off) would be on very shakey ground with regards to materials integrity.
It's just not worth the price of an unexpected crash and a visit to the Base Lodge Med Center because of boot materials failure or boot/binding issues. it's not just that the boot breaks, it's what happens to the skier when that happens.
True story - guy I ski with had his Technica TNTs explode at the top of AVY 2 on Lincoln (Mammoth). Thankfully all he did was body-punch the next mogul and being a sturdy guy he groaned a bit but was mostly whole. I would prolly have dislocated something doin the same body-punch.
If one thinks a certain chute is sketchy while on skis, try climbing down in broken boots... he had to hoof it down to the bottom of Chair 2 - about 1 mile of post-holing down the deep sides of the trails...
you can ski with bent poles
you can ski with ratty skis
crap (mis-sized, explodomatics, badly worn soles, etc...) boots are an injury waiting to happen... just not worth the risk. I would want something 'branded' and with ISO 5355
given the many options, there are plenty of ways to get some good, even great, high quality, well fitting boots on a budget.
.... just sayin