Nco ua npuas ncauj ntom yog qhov tseem ceeb ntawm kev txiav txim siab kev txhawb nqa; high-density materials (eg, 80D and above) offer more durable support, making them ideal for larger users or those requiring firm support, while lower-density materials are softer and better suited for those preferring a lighter feel. Lumbar txhawb nqa feem ntau ntsuas 40-55 cm (qhov siab) los ntawm 35–45 cm (dav), thiab caj dab hauv ncoo ntsuas 30–40 cm (qhov siab) los ntawm 20–30 cm (dav), kom ntseeg tau tias kev sib raug zoo nrog cov rooj zaum hauv tsheb feem ntau. Tsis tas li ntawd, cov kev xaiv customization muaj, tso cai rau cov neeg siv los kho qhov ntev thiab xim lossis ntxiv cov khoom lag luam (raws li cov txheej txheem kev cai tshwj xeeb).
