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.

Quickie Q300 M
Length: 1060 - 1180 mm (41.5“ - 46.5“)
Seat Width: 385 - 510 mm (15" - 20") (2” Extra seat width with SEDEO Pro Single Post Armrests)
Seat Height: 410 - 490 mm (16" - 19")
Seat Depth: 410 -560 mm (16" - 22")
Seat Tilt: 0° - 12° (Fixed Tilt)
Power Seat Tilt: 30° Powered Tilt
Seat Lift: 300 mm
Front seat height: 410 mm - 490 mm
Additional Growth (Width): 2"
Backrest Height: 460 -510 mm (18" - 20")
Back Recline: -4°, 0°, 4°, 8° & 12°
Turning Radius: 560 mm (22")
Centre of Gravity: Yes
Front Wheel Size: 7"
Rear Wheel Size: 12" / 13" / 14"
Max. Range: 36 km
Speed: 6 kph / 8 kph / 10 kph
Batteries: 41 Ah / 56 Ah
Maximum Safe Slope: 6°
Max Kerb Climb: 70 mm (12” Drive Wheels) / 100 mm (14” Drive Wheels)
Light And Indicators: Yes
Electronics: VR2 / R-Net
Min. Weight: from 103 kg (inc. 41 Ah batteries)
Total Weight: 103kg (41Ah Batteries)
Maximum User Weight: 136 kg
Crash Tested: Yes