I have Rheumatoid Arthritis and the most affected parts of my body are my feet & toes!  I have serious laxity in my connective tissue (in my feet) that causes my arches to flatten upon standing, requiring firm arch support.  I also have hammer toes, so I need all the space in the toebox that I can get, & I need 3/4 length insoles rather than full length.  And since most shoes do not have built in arch support, insoles/orthotics are my only option.  I own about 25 different types, styles & sizes of insoles & arches, & these orthotics are one of my top 3 favorite insoles.  They are quite rigid, which is exactly what I need for full support.  These fit into most of my dress ankle boots and "larger" shoes & boots, but not into dress ballet flats, or slimmer profile shoes, like some of my dress oxfords.  I wish they would make an orthotic slightly trimmer, ie - less wide, so I could use them in even more shoes!
These are very good quality.  I wear ankle boots all winter and this one pair of orthotics has held up after 6 months of daily use and they still look fairly new.  These won't work in every shoe, (like every other orthotic out there) but they are decent quality & they provide the support I need.  I hope this helps someone!
;)