Sweater sleeve design: This unique design at the top of the socks is likely intended to improve comfort and adjustability. It is not uncommon for people with diabetes to experience swelling in their feet and legs, so a sock that is flexible and can accommodate changes in size can be very beneficial. Additionally, this design could enhance air circulation and further promote comfort.
Gentle shrinking without leaving marks: Diabetic patients can have sensitive skin due to poor blood circulation and neuropathy. A sock that can shrink gently ensures a snug but not tight fit. It's vital that the socks do not constrict blood flow or leave indentations on the skin, which could lead to pressure sores or ulcers.
Maximum width of more than 8 inches (20cm) at the top: This wide opening allows for easy wear and removal, reducing the chance of injuring the feet or calves while dressing. It also accommodates for swollen feet or calves, common in diabetic patients due to fluid retention.
Reaches mid-calf: This higher length provides extra support and warmth to the lower leg, which could help improve circulation and reduce the risk of deep vein thrombosis. It also offers extra protection against cuts and scrapes, which could be a problem as healing may be slower in diabetics due to poor circulation.
Suitable for any calf with muscle or calf in a state of swelling: Diabetic patients often deal with edema or swelling in the lower legs and feet. These socks have been designed with this in mind, so they can comfortably accommodate and support a swollen foot or calf, reducing discomfort.
These features seem to be unique, and I personally think such a design provides unique value to these socks, and they are very important to the user..