• Maximum walking distance during forced-pace walking: Following a rest period of at least 20 minutes, participants will complete a 6-minute walk test in which they will be instructed to walk as far as possible within 6 minutes. This test simulates community walking better than treadmill testing, has been recommended as a primary outcome in claudication trials, and has good inter-day reproducibility (coefficient of variation 10.4%). A straight 30-m course will be used and the distance walked recorded. A testing checklist and standardised instructions will be used. The outcome assessor will have no role in the sizing and fitting of the shoes, in an attempt to keep them blinded, and the verbal test instructions will be audio-recorded so that we can check the consistency of which the instructions have been delivered.