A. Taped seams are where tape is applied to a garments seam from the inside. It stops the water from penetrating through the stitched holes in the material.
Critically taped seams are when only the main seams have been taped which tends to be the hood, neck and shoulders.
Welded seams are when two pieces of material are fused together when heat and pressure are applied. Welded seams work best as there are no stitch holes for chemicals or water to penetrate.