Critically taped seams: This means that the most important seams have been taped. Taped seams guarantee waterproof seams. Elastic waistband: This waistband is fully elasticated. Geotech 10.000 series: This number tells you how waterproof this garment is. For this item you can place a square tube with inner dimensions of 30mm x 30mm over the outer fabric with water to a height of 10k mm before water would begin to seep through. PFC-Free Regular Length: This garment has a regular length.