Sleeping Bag Fjord Nansen BIVAK Envelope Shape 8°C / 1190g

Sleeping Bag Fjord Nansen BIVAK POLI RIPSTOP 8°C Envelope Shape

Sleeping Bag Fjord Nansen BIVAK is a classic envelope-style sleeping bag designed for family camping and sheltered outdoor use with a T lim temperature rating of 8°C and total weight of 1190 g (without cover). This model can successfully replace a quilt, as it fully unzips into a flat blanket configuration. The filling is Eco Loft Hollowfiber, a lightweight and soft insulation made of spirally twisted siliconized polyester fibers. The outer fabric is POLI RIPSTOP, while the inner lining uses POLICOTTON, a vapor-permeable material that helps maintain a proper microclimate inside the sleeping bag. Temperature parameters are determined according to EN 13537 / EN 23537 standards, including T max 24°C, T comfort 13°C, T limit 8°C, and T extreme -3°C.

Eco Loft Hollowfiber insulation consists of spirally twisted siliconized polyester fibers that trap air within their structure to provide thermal efficiency at low weight. The elasticity of the fibers helps the filling maintain loft and softness during regular use. Selected Fjord Nansen sleeping bag models are tested in a Weiss climate chamber using a 16-element DIANA thermal mannequin according to PN-EN 13537-2004 methodology. Based on these controlled laboratory measurements, objective thermal ranges are assigned to reduce the risk of selecting an unsuitable sleeping bag.

Features

• ➤ Lightweight build: 1190 g total weight (without cover) for practical transport and storage.
• ➤ Envelope construction: Fully unzips and can be used as a quilt during family camping.
• ➤ Durable outer fabric: POLI RIPSTOP construction increases resistance to tearing.
• ➤ Technical zipper system: High-quality two-speed zipper with ANTI-BITE protection against fabric jamming.
• ➤ Synthetic insulation: Eco Loft Hollowfiber made of spirally twisted siliconized polyester fibers.
• ➤ Functional interior: Internal 20 x 20 cm pocket with identification card for small valuables.

This sleeping bag is suitable for summer camping and sheltered outdoor use in campsite environments. During overnight stays temperatures can drop toward the 13°C comfort level despite warm daytime conditions. When nighttime air approaches the 8°C limit threshold, the Eco Loft Hollowfiber insulation supports thermal balance inside the envelope construction. The vapor-permeable POLICOTTON lining helps regulate moisture, maintaining a stable microclimate during sleep.

Technical Specifications

Materials and Design

• Eco Loft Hollowfiber synthetic insulation with spirally twisted siliconized fibers for thermal efficiency.
• POLI RIPSTOP outer shell with reinforced weave structure.
• POLICOTTON vapor-permeable inner lining for microclimate regulation.
• Two-speed zipper equipped with ANTI-BITE anti-jamming system.
• Envelope construction allowing flat quilt-style use.
• Internal 20 x 20 cm pocket for valuables and identification.

• T max (Upper comfort limit) – temperature at which a partially uncovered person does not begin to sweat.
• T comfort – lower comfort limit at which the user remains in thermal equilibrium without feeling cold in any part of the body.
• T limit – lowest temperature at which a curled-up person can sleep comfortably.
• T extreme – extreme temperature with risk of hypothermia; survival conditions limited to approximately six hours.

About Fjord Nansen

Fjord Nansen is a European outdoor equipment brand specializing in sleeping bags, tents, and trekking gear. The company applies standardized climate chamber testing according to EN 13537 and EN 23537 methodologies. Fjord Nansen sleeping bags are known for objective thermal classification and durable RIPSTOP constructions for camping use.