Genesis 4S Sleeping Bag

Temp. Guide

Comfort: -14°C (6°F)
Limit: -21°C (-5°F)

Carry Weight

​​4 lbs 15oz (2.25kg)


$172.99 CAD

Compact & lightweight 4 season sleeping bag. The generous mummy shape is comfortable while providing exceptional thermal efficiency.

Shape: RectangularCritical Layer Construction
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  • Mummy shape for warmth and thermal efficiency
  • Insulated sculpted hood provides secure fit and more warmth
  • Boxed foot construction for warmth and comfortable sleep
  • Insulated neck yolk to help trap heat
  • Suresoft brushed polyester lining is warm and comfortable
  • Drawcord at shoulder – use it to trap heat in and keep the cold out
  • 2-way nylon coil zipper allows for venting; reversible slider with hi visibility fabric
  • Anti-snag zipper tape, and insulated draft tube behind zipper
  • 4 fabric loops allow for attached cord to hold sleeping pad in place
  • Inside zipper pocket to store small flashlight, smart phone, etc.
  • Compression carry bag with 2 YKK quick release buckles
  • A few words on temperature ratings…
  • Hotcore Sleeping Bag Owner’s Manual and Warranty Information


The Genesis 4S has been one of my go-to bags for spring, fall, and winter camping adventures. Hotcore has done a great job balancing weight, comfort and performance in this cozy mummy bag.

​~ Brad Jennings, Explore the Backcountry




Mummy shape for warmth and thermal efficiency


73″ w/ insulated hood (185 cm)


33″ (84 cm) at shoulders
19” ( 48 cm) at the foot

Carry Weight

4 lbs 15 oz lbs (2.25 kg)

Carry Size

14″ long, 10.5″ diameter (35 x 26 cm)

Temperature Guide

Comfort: -14°C (6°F)
Limit: -21°C (-5°F)
A few words on temperature ratings…


Trueloft microfiber; 0.7 Denier, siliconized; Critical Layer Construction

Outer Fabric

Polyester diamond ripstop 75D/ 230T
Colour: Crimson Red

Inner Fabric

Soft touch pongee polyester


#5, 2-way nylon coil self-healing zipper (right side only)
High visibility fabric zipper pull

* all measures approximate

Critical Layer Construction
We use thermal body-mapping construction to place the insulation where it will do the most good. You already have an insulating sleeping mat below you, and most of the sleeping bag insulation that is below will be compressed by your body weight, making it inefficient. We move much of this insulation to the top of our sleeping bags where it will trap warmth from your body.

Then we add an extra layer of TrueLoft™ insulation in the core body area, from the neckline to below the beltline, to help achieve and maintain the temperature ratings. This extra layer of insulation will trap more warmth from the body than comparable sleeping bags, while adding very little to the weight, size, and cost of the sleeping bag. Think of it as putting on a jacket, the first thing we all do when we need to stay warm.

We call this Critical Layer Construction.

High quality TrueLoft™ micro fibre synthetic insulation traps more warm air between its fibers than traditional insulations with the same loft. This gives you a warm, soft sleeping bag in a compact and lightweight size.

  • Lightweight – some of the lightest weight insulation available
  • Compressible – siliconized fibres slide easily allowing for greater loft, compressibility, and softness
  • Breathable – insulation and fabrics breathe to allow heat-robbing moisture & humidity to escape
  • Extremely quick drying – hydrophobic qualities allow TrueLoft™ to absorb less water and dry quickly
  • Warm when wet – while drying, TrueLoft™ still keeps you warm, performing better than inferior insulations