My husband has tried various other brands of socks ,none of which
remotely resembled the L/XL I chose for him.
He finds Posey socks comfortable and true to advertised sizing.

Configura Advance | Dropdown Sidepiece Kit with Armrest
The Sidepiece kit attaches to the Dropdown Armrest and fits the Configura Advance Chair to facilitate seamless side transfers. Suitable to use with slings to provide comfortable and safe transfers. The Sidepiece kit provides custom comfort and support for users, with 3 different adjustable height settings.
Configura Advance Dropdown Sidepiece Kit incl Armrest.
The Sidepiece kit attaches to the Dropdown Armrest and fits the Configura Advance Chair to facilitate seamless side transfers. Suitable to use with slings to provide comfortable and safe transfers. The Sidepiece kit provides custom comfort and support for users, with 3 different adjustable height settings.
Black Vinyl
3 armrest settings: 6", 7", 8" (Standard)
Suitable for Configura Advance Chair