HEALTHY HUMAN SILICONE PROTECTIVE BUMPER BOOTS - One size (small) for 16oz and 21oz bottles, larger size for 32oz and 40oz Healthy Human sports bottles. BUMP THOSE DENTS AWAY - Avoid unwanted dents, scratches, and dings with this extra layer of protection. CUSTOMIZE YOUR BOTTLE - The Healthy Human Bumper Boots are the perfect accessory for your bottle. Pick a color that matches your bottle or create a unique blend of colors. HIGHEST GRADE QUALITY - The Bumper Boots are BPA-free and are made of the highest quality silicone material. Easy to clean and install. 100% SATISFACTION GUARANTEED - If you have any question about the Bumper Boots,, please don’t hesitate to contact us, we will try our best to give you a satisfactory solution. We wish you to be a Happy Healthy Human!