1. Made of soft skin-friendly silicone material, waterproof.2. With a replaceable TPU capsule that infused with pure natural plant essential oils, which repels mosquito and other insects through the release of citronella around the bracelets.3. long lasting about 6 months protection4. Adjustable design, one size fits all5. Non-toxic, healthy6. Perfect use for travel, hiking, BBQ, climbing, and fishing.