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.

Sheepskin Top Pad for Underarm Crutches
• Provides additional comfort
• Natural fibre reduces the risk of skin irritation
• Machine washable
• Genuine Australian lambswool
• To suit timber and aluminium underarm crutches