Cov tawv hauv qab yog hollowed thiab perforated tsim, uas zoo heev txhim khu lub breathability ntawm tawv, ya raws thiab qhov cua, los tiv thaiv plam thiab hnav-resistant, thiab instantly paub lub thawj lub tsheb hluav taws xob qhov cua, cua sov thiab lwm yam dej num.