Scale goes like this: Level 5. Heavy boots and socks must be worn at all times. Level 4. Boots or shoes and socks must be worn at all times. Level 3. You can take boot or shoes off part of the time, no socks needed. Level 2. Can go all the way down to non-strange looking minimalist shoes. Level 1. Any footwear is ok, flip flops to VFF. Level 0. Barefoot all day. Mine comes in on level 0. Barefoot helps me do my job better.