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a quick google reveals the techno blurb
"Rain resistance is measured as a hydrostatic head in millimetres (mm). This indicates the pressure of water needed to penetrate a fabric. Heavy or wind-driven rain has a higher pressure than light rain. Standing on a groundsheet increases the pressure on any water underneath. Fabric with a hydrostatic head of 1000 mm or less is best regarded as shower resistant, with 1500 mm being usually suitable for summer camping. Tents for year-round use generally have at least 2000 mm; expedition tents intended for extreme conditions are often rated at 3000 mm. Where quoted, groundsheets may be 5000 mm or more."
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Baby Milk Action is a non-profit organisation which aims to save lives and to end the avoidable suffering caused by inappropriate infant feeding.
http://www.babymilkaction.org/
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Topic: What is hydrostatic head mean
the one I looked is 4000 is this any good for a weekend break ?
