From: Australian Diabetes Foot Network: practical guideline on the provision of footwear for people with diabetes
Criteria for choosing protective footwear features
These should be made from leather or a combination of materials (such as those used in sports shoes) with smooth inner lining and no bulky seams at the toe area.
1 cm from end of longest toe when client is standing.
Accommodate the toes without causing pressure.
The sides of the shoe should not bulge over the last (sole) when worn.
Less or equal to 2 cm.
Adequate fastening such as laces or Velcro to keep the foot from sliding forward.
Cushioned outer and inner soles
Approximately 0.5-1 cm thick under the forefoot.
Open backed shoes can result in injury to the skin around the heel and usually require the individual to claw their toes in order to keep them on, also increasing risk of ulceration.