Exped SIM 3.8 LW Self-Inflating Sleeping Mat Flame

The Exped SIM 3.8 LW is a self-inflating sleeping mat designed for three-season use, offering a perfect balance of comfort, warmth, and packability. With an R-value of 3.8, it provides reliable insulation down to -4°C (25°F), making it ideal for spring, summer, and autumn adventures. The rectangular shape and generous dimensions (197 x 65 cm) ensure ample sleeping space for side sleepers and restless campers.

Advantages

Self-inflating open-cell PU foam core simplifies setup – just open the valve and let the mat do the work. The Exped FlatValve system allows easy inflation and deflation, with a mouth top-up option for personalized firmness. Durable 75D polyester fabric with TPU lamination is Oeko-Tex® 100 certified and PVC-free, ensuring long-lasting performance and environmental responsibility. The included stuff sack and repair kit add convenience and peace of mind.

Suitable for

• Backpacking and camping in three-season conditions
• Campers who prefer a self-inflating mat for quick setup
• Sleepers needing extra length (LW version) for taller individuals

Key specifications

• R-Value: 3.8
• Temperature Rating: -4°C (25°F)
• Season Rating: 3-Season
• Dimensions: 197 x 65 x 3.8 cm (77.6 x 25.6 x 1.5 in)
• Packed Size: 33 x 16 cm (13 x 6.3 in)
• Weight: 0.0 kg (weight not specified, but typically around 0.9 kg)
• Top/Bottom Fabric: 75D Polyester, TPU film laminate, Oeko-Tex® 100 certified
• Insulation: Open-cell PU foam
• Valve: Exped FlatValve (inflate/deflate)
• Shape: Rectangular
• Color: Flame (Orange/Red)
• Included: Stuff sack, Repair kit

Recommendations

For optimal comfort and insulation, pair this mat with a sleeping pad or groundsheet. Store the mat with the valve open to maintain foam loft. Avoid prolonged exposure to direct sunlight.