Berkshire MicroSeal Supersorb® Lite is a highly absorbent. ultrasonically sealed, cleanroom laundered wiper recommended for critical environments rated ISO Class 3 and above. With two-ply, 100% continuous filament polyester knit fabric, the wiper is ultrasonically bonded together. World class fiber and particle performance make MicroSeal Supersorb® Lite suitable for the most critical spill control and cleanroom cleaning applications.