Naturally Effective Plant-Based Formula: Using 100% plant-based insecticidal compounds as active ingredients, without containing either DEET or Pyrethroids, this collar helps protect dogs and cats from annoying or sometimes dangerous biting insects naturally, safely, and effectively. Built-In Lasting Protection: This collar is made with non-allergic soft thermoplastic rubber. The natural active ingredients are integrated into the collar material during the polymer melt process and slowly release over time, providing continuous protection for cats and dogs around the clock. Flexible & Adjustable to Fit All Pets: This collar is designed to suit all pets. With an adjustable length of up to 25.59 inches (65 cm), it can be used on both dogs and cats of all ages and sizes, from kittens to large breeds. Simply fasten and trim the excess length to fit. Easy and Comfortable to Wear: Fasten the collar around your pet’s neck, ensuring there is enough room for at least two fingers, then remove the extra length. The collar is lightweight and comfortable for pets to wear. All-Weather & Waterproof: Because the active ingredients are integrated into the collar material, it withstands various weather conditions and is waterproof. Its effectiveness remains consistent even when exposed to water. Pet owners can confidently allow their pets to wear the collar while bathing, swimming, or playing in the rain. Please pay attention to the size and dimensions of the product to ensure it meets your needs. For any questions or concerns, feel free to reach out for assistance.