Extremely solid, this thing will withstand anything your pup sends at it.
My one point of feedback would be that there are A LOT of "connection points" where a piece of hardware connects to the fabric and then back to more hardware, or where plastic pieces go over the points in-between the connections. The plastic pieces are HARD and have sharp corners and the multiple stitch points create multiple potential rub points on the interior of the collar. Will be great for outdoor time and activities but I'll be looking for something with fewer edges for every day.