HyVent Alpha
Breathability: 700-750 g/m2/24 hrs avg (MVTR) Upright Cup*
Waterproof Rating: 75 PSI avg, 75 avg PSI after 20 launderings
Usage: Summit Series
HyVent Alpha is a laminate PU layer that can be constructed in both 2 layer
and 3 layer forms. HyVent Alpha in 2 layer form includes a drop liner, while
3 layer fabric includes a tricot mesh backer bonded to the HVA fabric for
increased durability and comfort. A laminate (HV Alpha) differs from a
coating (HV and HVDT) in that a laminate is a separately manufactured layer
or sheet of Polyurethane which is adhered to a fabric layer. A coating is
created when liquid PU material is spread over a fabric and allowed to dry.
Because Alpha is a laminate, durability is at a maximum because the
waterproof characteristics do not diminish with increased laundering cycles.
Laminates are manufactured to precise performance specifications, while
coatings are more difficult to control especially when combined with bulky (
high denier) or textured yarns. HyVent Alpha is constructed to be actively
breathable, especially when compared to regular HyVent which requires water
(perspiration) to condense before passing through.