Abstract: A three-dimensional knit fabric comprising two knit layers consisting of a front layer and a back layer and monofilament yarns connecting the two knit layers, characterized in that the three-dimensional knit fabric has a thickness of 5 to 25 mm, the fabric undergoes a compression load of 100 to 250 N for compressive deformation of 2.6 mm on a 100-mm diameter compression plate, and the front and back knit layers undergo a shearing stress of 15 to 35 N to be shifted by 5 mm in parallel to each other in transverse opposite directions (directions along the course line).

Abstract: A sheet material for a seat characterized in that the stress at 5% elongation (A) is from 40 to 300 N/4 cm width wherein A is a larger value between a stress measured in the longitudinal direction and a stress measured in the lateral direction, that the ratio A/B is from 1.5 to 15.0 wherein B is the smaller value obtained in the above measurement, and that the reduction in width (H) is from 0 to 15% when the sheet material is fixed on a frame at the one end and the opposite end while stretched and pressured.

Abstract: A sheet material for a seat characterized in that the stress at 5% elongation (A) is from 40 to 300 N/4 cm width wherein A is a larger value between a stress measured in the longitudinal direction and a stress measured in the lateral direction, that the ratio A/B is from 1.5 to 15.0 wherein B is the smaller value obtained in the above measurement, and that the reduction in width (H) is from 0 to 15% when the sheet material is fixed on a frame at the one end and the opposite end while stretched and pressured.