Generally, no. However, it can stain if not cleaned after exposure to excessive sweat or food debris like ketchup. I soak in hot soapy water and it does a good job but I remember some darkness on the ribbing wasn't coming off. It's unnoticeable unless looking for it. For a deep clean maybe stain remover and a soft toothbrush would be better.

Very comfortable to wear sleeping. It washes well. I soak in hot soapy water, stretch it, and rub my fingers on it. I'd say it gets like 95% clean. I feel like it leaves behind some minor stains though. Nothing noticeable unless you're looking for it but nonetheless it's there. For a better cleaning maybe a soft toothbrush and a stain remover may help.

@@JoeyIoT thanks! And how did the sizing work out for you? I sized down because I heard it stretches with use.

@@justinhunter4991 You're welcome! If I remember correctly, I used the sizing guide on the ordering webpage from google and it's been good so far. My wrist is 175mm and I ordered a large band. It says I should've sized down because I'm between sizes but I wanted a loose fit. That's just personal preference though. Thankfully it's not too loose. I just didn't want it snug because for that I can use the active band. But regardless, I think you should be good. The backside of the watch does a decent job at staying in place too. If it goes on sale I would like to get another color of the same band in a M and compare it.

store.google.com/product/watch_band_stretch