Mister Negative or Martin Li also runs F. They are not heavy and can be worn with high quality fashions. After trying 10 different styles of earplugs, a friend of mine gave me a pair of these to try. The only thing that bothered me was the headset came with outdated software. So, please be aware of this. I almost didn’t purchase this because of all the negative reviews. Spero come sempre di essere stato utile. I did find what I wanted albeit not the Stride Rite that I have depended on. Lo uso principalmente con un cargador rápido de la misma marca (Ugreen) y carga mi iPad Pro de 12" en menos 3 horas. I love these slippers so much.