CURV and TECH share some similarities in their key features such as their use of PM0.1 filter technology and having 3 layers. However, there are also notable differences between the two. CURV's key feature is its spacious 3D structure, providing extra space inside the mask for better breathability. On the other hand, TECH's key feature is its weightless feel, making it ultra-light and comfortable to wear. CURV weighs about 0.36 oz / 10.23 gm, while TECH is even lighter at -0.3 oz / 8.21 gm. CURV has a round and structural shape, while TECH is pliant and contoured to the shape of the face. Both masks are washable up to 100 times, making them eco-friendly options. However, the design and material of the two masks are quite different, so it's important to choose the one that best fits your needs and preferences.