Buy At: Ulta
Ulta's Website: http://www.ulta.com/ulta/browse/productDetail.jsp?skuId=2229996&productId=xlsImpprod3220077&navAction=push&navCount=1&categoryId=cat80084
Real Techniques' Website: http://realtechniques.com/shop-collection/your-base-flawless/powder-brush
When opening these brushes they have a little bid of a bad, packaged smell, but it goes away when washed. I haven't lost any bristles yet while using them to apply powder or while washing them.
This is a fairly large powder brush, as you can tell when it's compared to my hand. This makes applying setting powder super easy and quick.
This brush even looks soft in pictures. I'm planning on getting one soon, but I don't have Sigma brushes to compare these to. But, by my standards this brush is really silky soft.
I pressed the brush into the floor to show how not dense it is. This brush has a lot of bristles, but isn't dense which makes it easy to apply powder without moving your foundation or concealer.