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.

JAY Fusion with Cryo® Fluid Technology Wheelchair Cushion
Height: 8.5 cm
Depth: 38 cm - 60 cm
Total Weight: 3 kg (40 x 46 cm with Cryo Fluid)
Maximum User Weight: 150 kg (40 cm – 50 cm widths); 225 kg (56 cm – 60 cm widths)
Cover Type: Incontinent, Microclimatic and Stretch
Cushion Type: Cryo Fluid