It fits my helmet pretty good and does what I want it to. What is that? I wanted to seal the top of the helmet for riding in cold weather, and I wanted to increase my visibility in dim light. Cold weather brings shorter days... This has done what I needed it to.

PROS:
I picked this helmet cover up a little over a year ago and it has served it's purpose admirably during that time. Between the bright flourescent coloring and the reflective striping, it provides great visibility to vehicles. It works well as both a windblock (the primary reason I ordered it) and to block the rain. As a bike commuter, I was looking to cut the chill from the wind and this works wonderfully in that case.

CONS:
As others have mentioned in their reviews, the sizing doesn't seem ideal but I'm able to make it work over my helmet - it tightens down via the string just at the bottom edge of my helmet but doesn't fully wrap around the bottom. Due to this fit, it can slide a bit but has never been an issue for me.

The drawsting works okay, but would work better if it were just slightly bigger in order to cinch under the helmet. The drawstring was a source of consternation in the last few days as the drawstring had pulled itself out of the threading/seam. I was able to thread the drawstring back through and tie it together to make the cover functional again.

Overall, the helmet serves it's purpose at the price point and is able to overcome it's flaws.

I ordered the yellow and orange helmet covers. Chief purpose of my purchased was for VISIBILITY. Auto drivers do not always look out for bicycle riders. Fits well on helmet and highly visible with reflective segments in material. Blocks wind that could pass through and make top of head cold in winter time. Also repels rain from entering helmet. My plan is to use it year round.

I purchased a few of these. One for my young (10 year old) son who likes to bike everywhere all the time, and one for my much more conservative teenage daughter (who also likes to bike but in more of an adult way). My son actually commented on how he liked how reflective it was. My daughter liked how it helped with keeping rain out of the helmet.

They have very different shaped helmets (my son has more of a "ski - or round shaped" one) my daughter more of a "normal" bike shaped one - but the drawstring and shape of the fabric worked for both.

I like feeling they're safer with the reflection from car headlights.

Just as the seller stated and it looks very good on my helmet, also it came on time and well wrap! I would recommend this product for anyone,
who ride a mobility vehicle or bicycle at night as well as in the community! The cover have a draw string to tighten it on any size adult helmet, but a little child's helmet will be too small for this cover!