1. See mattess appearance namely whether thickness is even, surface is flat, line mark is symmetrical and beautiful, see mattess even at the same time have certificate of qualification.

2. Evenly test the surface of the mattress by hand, the filling is evenly distributed, the quality of the mattress with the balance of rebound is better, and it is best to lie down and feel for 5 minutes.

3 beat the mattress, listen to the sound of the spring in the flapping, if there is a uniform spring sound, that the spring is better. If under the extrusion often emit crunch, crunch noise, it is possible that the spring has rust or poor elasticity.