1. **Comfort and Fit**: The TrelaCo earplugs are designed with soft silicone, ensuring a comfortable fit without causing irritation or allergic reactions. Users have praised their ease of wear and the snug fit provided by the slow-rebounding material.

2. **Noise Reduction**: These earplugs effectively reduce noise by up to 29 decibels, making them ideal for various environments such as construction sites, concerts, and even during sleep. The three-tier design allows users to control the level of sound reduction, which is particularly useful for those who need to remain aware of their surroundings.

3. **Durability and Reusability**: Made from TPE material with a PVC cord, these earplugs are both durable and waterproof. They can be easily cleaned under water, extending their usability over time. However, some users have reported issues with the cord being too short and prone to kinking.

4. **Versatility**: Suitable for a wide range of activities including swimming, shooting, and traveling, these earplugs offer versatile hearing protection. The attached cord prevents loss and makes them convenient to use throughout the day.

5. **User Feedback**: While many users appreciate the comfort and effectiveness of these earplugs, some have raised concerns about an oily residue and a strong plastic smell upon opening the package. Additionally, a few users found them uncomfortable when pushed too hard into the ear canal.

6. **Conclusion**: Overall, the TrelaCo 170 Pairs Corded Ear Plugs provide a cost-effective solution for noise reduction with added convenience due to their reusable nature and attached cords. However, potential buyers should be aware of possible discomfort issues related to fit and initial product quality concerns.