How to choose the right size
User size: Measure your total height, barefoot, in an upright position.
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
| Cut | Description | Benefits | Recommended use |
|---|---|---|---|
| Mummy | Slim fit, 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 too much heat loss | Trekking, long-distance hiking |
| Women | A specific cut, narrower at the shoulders and wider at the 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, mountain huts |
| 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 close fit improves thermal efficiency, while a looser fit prioritizes comfort. The lengths indicated correspond to the brand's general recommendations.
🛏️ Floor mattress – Sea to Summit
| Size | Length (cm) | Width (cm) |
|---|---|---|
| Shorts | 168 | 55 |
| Regular | 183 | 55 |
| Wide | 198 | 64 |
| Rectangular Regular | 183 | 64 |
| Rectangular Large | 198 | 64 |
🛏️ Sleeping mat thicknesses – 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 + security | Camping, expeditions, air redundancy |
| Comfort Deluxe | 10 | Maximum | Camping, van life, comfort first |
| Self-Inflating | 3.8 – 7.5 | Variable | Camping, multi-purpose use |
The thickness of the mattress directly influences comfort and insulation. Thicker mattresses are particularly recommended for side sleepers or uneven surfaces.The dimensions indicated correspond to standard Sea to Summit sizes.
- Shipping costs : Shipping costs may vary depending on the weight, dimensions of the package, and the 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 delivery charge may apply even if the minimum order for free delivery is not met. 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 to 16:30
- Tuesday: 10:00 to 16:30
- Thursday: 10:00 to 16:30
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 completing your purchase.
If the product you purchased has a manufacturing defect or is faulty, we want to resolve it quickly. Please email us at info@marchealpin.caPlease include 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 - Mummy Compact
Description
Description
The Sea to Summit Reactor Extreme Mummy Compact sleeping bag liner is designed to significantly increase the warmth of your sleeping bag while improving comfort and hygiene while camping. Made from high-performance thermal fabric, it's ideal for cold nights, expeditions, or extending the usable range of your existing sleeping bag, all while remaining compact and easy to carry.
Benefits
• Provides significant thermal relief on cold nights
• Improves comfort and warmth inside the sleeping bag
• Protects the sleeping bag from dirt and moisture
• Compact and lightweight design, easy to carry
• Compact mummy cut suitable for technical sleeping bags
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
Zero stores, only deals
Alpine Market, it's a online store Specializing in outdoor gear. No 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 the brands. Quantities are always very limited: when it's gone, it's gone.
