SEA TO SUMMIT®
Ascent 1 AAC-I -4°C Down Sleeping Bag
Light, warm, comfortable and most importantly, adaptable. The Ascent™ is the sleeping bag of choice for most adventures, most of the time. Offering the perfect backpacking balance of comfort vs weight, the Ascent™ Series sleeping bags by Sea To Summit have more space than traditional mummy bags, yet still provide the thermal efficiency you need when exploring above the tree-line.
The Free-Flow triple-zip design ensures your sleeping bag
retains maximum warmth and efficiency when needed and multiple
ventilation options when it’s not. The half zip on the right side of the
bag provides freedom of movement for both arms, additional ventilation
and means the top third of the bag can be folded down as a mini quilt.
The full length, two-way left side zip and separate foot zip transforms
the bag into a full quilt for when the mercury climbs higher than
expected. If it’s warmth you’re after, close all the zips, pull the cord
locks tight to drag everything in, and relax in luxurious comfort.
The generous allocation of high quality 750+ Loft Ultra Dry Down provides great insulation, while the oversized draft tubes prevents your body heat escaping. The paneled foot-box and 3-dimensional hood make sure you’re not compressing the down when you’re trying to stay warm. Vertical baffles over the chest section ensure the down insulation cannot migrate or shift to the outside of the bag during sleep, creating cold spots. A side block baffle construction maintains the 60/40 fill ratio, keeping more down on the top of the bag for maximum insulation.
Dimensions (Regular):
Dimensions (Long):
ULTRA-DRY Down is a permanent* Nano-level water repellent polymer
treatment applied to our high loft, high quality down. The Nano-thin
treatment vastly improves our downs reaction to water without effecting
its weight or loft performance. ULTRA-DRY Down retains over 60% more
loft and absorbs 30% less moisture when compared with untreated down.
Sea to Summit sleeping bags dry out 60% faster than bags with untreated
down.
The Nano-level treatment also inhibits bacterial and microbial growth,
which makes Sea to Summit sleeping bags more hygienic and improves their
lifespan.
*No loss of treatment effect has been seen in over 14 wash cycles.
About EN13537 Temperature Rating System:
Although the EN13537 standard does not identify a single precise
temperature a tested sleeping bag is suitable for, it does provide an
industry standardised temperature range that a typical user can refer to
as a guide for the conditions their bag will be most comfortable in.
The EN13537 standard provides three temperature levels to guide a consumer in their choice:
The EN13537 temperature tests use a thermal manikin with heaters and temperature sensors to measure the insulation value of a sleeping bag. This manikin is wearing one layer of long underwear and is placed inside the sleeping bag on an insulating mat. The test is conducted in a temperature controlled chamber and a range of comfort temperatures are derived from measuring the energy required to maintain homeostasis in the manikin to a set temperature.
All Sea to Summit sleeping bags have been tested to the EN13537 standard. We recommend you use our EN13537 quoted ratings as a guide and a comparative reference to other EN13537 tested bags.