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.

Spex Ischal Contour Universal Positioning Base
The Universal Positioning Base assists with these challenges by insertion under the air/gel cushion. This configures as the base system per the user's clinical assessment to achieve a functional outcome for the user. Pressure care properties are no longer compromised.
The Spacer Universal Positioning Base comes with both an ischial contour base and a pack of 8 contouring obliquity pads. This is ideal for clients who require a pre-ischial ledge that supports the pelvis/thighs. It helps prevent the user from shifting forward on the wheelchair cushion. This is especially helpful for users with posterior pelvic tilt.
Length: 14" - 20"