How to choose the right size
User height: Measure your total height, barefoot, standing upright.
Use: Choose the most fitted size possible to optimize comfort, insulation, and weight.
🛌 Sleeping bags – Sea to Summit
| Bag size | User height (cm) | Internal length of the bag (cm) |
|---|---|---|
| Shorts | up to 170 | 185 |
| Regular | up to 183 | 198 |
| Long | up to 198 | 213 |
🛌 Sleeping bag cuts – Sea to Summit
| Cup | Description | Benefits | Recommended use |
|---|---|---|---|
| Mummy | Fitted cut, narrower at the feet and shoulders | Excellent heat retention, reduced weight | Mountaineering, trekking, cold conditions |
| large mummy | Mummy with more space at the shoulders and hips | Better comfort without excessive heat loss | Trekking, long-distance hiking |
| Woman | Specific cut, narrower at the shoulders and large hips | Enhanced insulation at the feet and torso | Hiking, trekking, camping in cool weather |
| Rectangular | Straight shape offering plenty of space | Maximum comfort, freedom of movement | Camping, van life, shelters |
| Quilt / blanket | Fully open or without cap | Modularity, lightness | Ultralight, bikepacking, mild temperatures |
The cut directly influences the warmth, comfort, and weight of the sleeping bag. A snug fit improves thermal efficiency, while a large fit large comfort. The lengths indicated correspond to the brand's general recommendations.
🛏️ Groundsheet – Sea to Summit
| Size | Length (inches) | Width (cm) |
|---|---|---|
| Shorts | 168 | 55 |
| Regular | 183 | 55 |
| Large | 198 | 64 |
| Rectangular Regular | 183 | 64 |
| Large Rectangular | 198 | 64 |
🛏️ Thicknesses of ground mattresses – Sea to Summit
| Range | Thickness (cm) | Comfort | Recommended use |
|---|---|---|---|
| Ultralight | 5 | Minimal | Ultralight, fastpacking, fast hiking |
| Camp / Lightweight | 5 – 7.5 | Good | Hiking, trekking |
| Ether Light | 10 | Very high | Camping, comfortable trekking, side sleepers |
| Comfort Plus | 6.3 (double layer) | High + safety | Camping, expeditions, air redundancy |
| Comfort Deluxe | 10 | Maximum | Camping, van life, comfort first |
| Self-Inflating | 3.8 – 7.5 | Variable | Camping, multipurpose use |
The thickness of the mattress directly affects comfort and insulation. Thicker mattresses are particularly recommended for side sleepers or uneven terrain.The dimensions shown correspond to Sea to Summit standard sizes.
- Shipping costs: Shipping costs may vary depending on the weight, dimensions of the package, and delivery address. These costs will be calculated and displayed at checkout.
- Free shipping: We offer free shipping on all orders of $150 or more, before taxes and after discounts.
- Oversized products: A shipping fee may apply despite the minimum for free shipping. This applies to oversized products (weight or volume).
Warehouse pickup
You can pick up your order directly from our warehouse to save on delivery costs.
Ready within 4 hours, depending on the pickup schedule at our warehouse at 7250 Clark Street in Montreal.
- Monday: 10:00 a.m. to 4:30 p.m.
- Tuesday: 10:00 a.m. to 4:30 p.m.
- Wednesday: 10:00 a.m. to 4:30 p.m.
- Thursday: 10:00 a.m. to 4:30 p.m.
- Friday: 10:00 a.m. to 12:00 p.m.
Return policies
All sales are final. No exchanges or refunds will be accepted, even if the color, size, or product does not meet your expectations. We encourage you to carefully review your selection before confirming your purchase.
If the product you purchased has a manufacturing defect or is defective, we want to remedy the situation quickly. Please send us an email at info@marchealpin.caenincluding a description of the problem and photos of the product in question. Our team will be happy to assist you and find a suitable solution.
Thank you for your understanding of our policy, which allows us to maintain such competitive prices!
Reactor Extreme Sleeping Bag Liner - Standard Mummy
Description
Description
The Reactor Extreme Sleeping Bag Liner – Mummy Standard from Sea to Summit is the warmest liner in the Reactor range. Designed to maximize insulation, it offers significant thermal gain, ideal for cold nights while trekking, hiking, or traveling. Its lightly brushed Thermolite Pro fabric provides remarkable warmth while remaining breathable and comfortable. This liner significantly improves the performance of your sleeping bag while protecting it from wear and moisture.
Advantages • Very high thermal gain to optimize cold nights
• Soft, breathable, and stretchy Thermolite Pro fabric
• Standard mummy shape for better thermal efficiency
• Ultra-compact and lightweight, perfect for 3- to 4-season adventures
• Extends the life of your sleeping bag
Features
Features
Payment and security
Payment method
Your payment information is processed securely. We do not store your credit card details and do not have access to your payment information.
Latest products purchased
Alpine Market is
No stores, just deals
Marché Alpin is an online store specializing in outdoor gear. We don't have a physical store, which reduces our costs and allows us to offer the best prices. We buy new products from previous seasons and samples directly from brands. Quantities are always very limited: when it's gone, it's gone.
