Material:PVC/PU/Canvas/Leather Resistance to Ground:107-108ohm Sole: PVC(MS-C01->MS-C12) Size:34#-50#,220mm-500mm PU(MS-C13->MS-C18) Used Cleanroom:10-1000 grade Volume of Resistance:106-109ohm washed times:>100 ESD SHOES Technical Information Surface Resistance: 10^7~10^10 Area of discharge: All parts of the sole area dissipate static electricity including the arch of the foot. Our esd shoes discharges static electricity regardless of foot position (e.g.. walking/seated or standing) Climate: Our ESD system is weather proof and footwear can be worn outdoors whatever the conditions. ESD standard: Complies with EN100015 and IEC 61340-5-1 Health and Safety Standards Soles: Rubber Vamp PVC,PU Slip Resistance: Approximately 0.55 on wet and 0.65 on dry surfaces (minimum industrial standard = 0.42) Size Ranges: From 34# to 48#( Chinese size)