The back is made of a hard plastic plate which has a square studs pattern and thus good tack.
The lateral section is of a not too hard and not too soft rubber material and projects beyond the edge of the display side light, which defused a fall on the side of the display (at least on level ground or on the corner of the smartphone).
Openings for Micros, Camera, etc. are cut precisely.
For those of Dene Outdoor Style likes strong buy recommendation.