I-Pinxing iqwalasela oomatrasi beyimfuneko ngokwezonyango i-DME kuphela apho ibhedi yesibhedlele iyimfuneko ngokwezonyango.
Ukuba imeko yelungu ifuna i-innerspring umatrasi okanye i-rabha ye-foam, iya kuthathwa njengeyimfuneko ngokwezonyango kwibhedi yelungu lesibhedlele.