1 Interchangeable needle kits are exactly what they sound like--a set of knitting needle tips, and a set of cords of varying length that can attach and detach from the tips to create many different combinations of needle sizes and cord lengths.
Poor circulation (blood flow) can make your foot less able to fight infection and to heal. Diabetes causes blood vessels of the foot and leg to narrow and harden. You can control some of the things that cause poor blood flow. Don't smoke; smoking makes arteries harden faster.
So the soles of shoes for people with diabetes have special stabilizers to keep feet level. You will notice that the soles are thick and wide. Thicker soles cushion your feet from wear and tear, and that little bit of extra width helps your feet to avoid those hot spots.