These sandals are designed with your health in mind, they are capable of strengthening your posture and the by placing pressure on certain points of the foot they can enhance any exercise that you may be doing.

Main Features:

Unisex styling - suitable for Men and Women of all ages and levels of fitness.
Ergonomically designed
Non-slip rubber sole
Dual sized
PU sole body and foot bed
Lined uppers to minimize friction
Detachable, elasticized heel strap for customized fit
Controls and aids weight loss and burns fat
Soft faux leather uppers
Vegan friendly
Weight of sandals depends on size (UK4 -9.5)
Starting weight of 1.7kg up to 1.95kg
Inspired by sand bag training methods - power diet shoes are designed to place minimal pressure on ankles, arch and sole of feet - while challenging the cardio-vascular system and enhancing your work out.
Heart rate is increased by up to 25%
Metabolism is increased
Approved by and registered with FDA (US Food and Drug Administration) as medical equipment which is suitable for physical therapy - FDA Number 3004512354. It was the first pair of shoes to be registered in relation to diet
Increased oxygen intake (lung and heart efficiency)
Improved flexibility
Reflexology nodules to stimulate reflex zones and aid relaxation
Wearing regularly will reduce cellulite
Just 30 minutes a day regular exercise can result in weight loss and increased fitness levels. Just 30 minutes of walking will exhaust an extra 300 calories
Corrects posture
Wakes up atrophic muscles
Foot bed nodules reduce foot fatigue
Increases BMR
Enhances circulation and breathing capacity
Improved digestion
Suitable for both indoor and outdoor exercise; not suitable for long distance walking.
Strengthened abdominal muscles while also toning legs, hips and bottom
Scientifically designed by Sports Technology professionals. ISO 9001 Certified. Patent PCT/Kr04/000325 (105 countries) Good Design award for outstanding Industrial Design Product. Designed by Kim Hee-Suk.
Strategically placed steel poles to increase weight of shoes while still being extremely comfortable
Poles are secure and wrapped in purposely designed materials, which minimize the shock caused when landing or jumping
Challenges body fat reserves when worn when walking
Excellent for strengthening the lower extremities
Purposely designed shock absorbing heel area which absorbs weight and minimizes impact at key impact areas
Bio-mechanic sole
Strengthens back muscles
Double criss cross feature
Contrasting light blue stripes

Cost is £50 ($100).

Source [Great Green Shoes]