I got some custom proflexs from my local pro shop for $60 and they came with a km strap. Before I got them I tried them on and they were so comfortable. I had to have them. From what I've seen about them they're bottom is flexible and helps bounces. It's good for yelling if you're a yeller. They're very easy to hear out of. They hav a wide range of vision, They are way more comfortable than the i4s. Another good thing about proflexs are that they are the most customizable mask out there. I'll be updating this review after I go and play next weekend.
I would reccomend this product to everyone. Better than the i4s and way cheaper. JT did a great job. Get this mask.