If your shoes suffer from the rigours of sweaty training, then treat them to a handy little bag that could breathe a fresh lease of life to the inside of your shoes! The natural properties of charcoal absorb moisture, removes smells and kills bacteria. To extend the life of this product, place in direct sunlight once a month for 4 hours. Place bag in your shoes when not in use. Running Trainer Fresheners Gym Shoes Fresheners