BEST USE: Ultralight Backpacking
PERFORMANCE: 3 Season
PACKED WEIGHT: 2 lbs 7 oz
PACKED SIZE: 4 x 18 inches
Shipping & Returns
Our warehouse is actively shipping orders from 8am to 1pm MST Monday through Friday. Most orders ship in one business day, but the transit time can take up to 7 days, depending on your distance from Boulder, Colorado.
2nd Day and Next Day Air orders will ship same day if placed by 1pm MST, Monday-Friday (except holidays).
All orders are eligible for fast and easy returns within 60 days of purchase.
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Alto one and two-person is a semi-freestanding tent perfect for weight-conscious backpackers who still want a high degree of livability in their shelter.
The revolutionary Tension Ridge architecture of the Alto allows for taller oversized doors and vertical walls that create an unrivalled amount of space. Apex Vents positioned at the highest point of the tent effectively expel moist air and minimize condensation, and the variable rainfly can be rolled back on both sides for stargazing, then deployed quickly from inside the tent.
‘Alto’ is the Italian word for ‘high’. One night will prove that the Alto is a level above other ultralight tents
Tension Ridge architecture delivers a better space-to-weight ratio than any tent in its class.
The gold standard in tent poles — our tents combine DAC Featherlite NFL, NSL and PRESSFIT sections.
The poles of the Tension Ridge™ are swept upwards like the dihedral wing of an airplane – not angled downwards as is common in tents. This raises the tent’s shape, providing significantly more head and shoulder room, higher doors, easier access and more usable vestibule space.
Typical of Sea to Summit’s commitment to refining details to make gear frictionless and more functional, these machined aluminum clips make setting up the rainfly (either with the inner tent, or with a footprint in ultralight configuration) quick and easy. And they are far more durable than plastic buckles.
Every Sea to Summit tent packs up into three stuff sacks to allow you to split the load easily. During setup, two stuff sacks transform into gear storage pockets, while the pole stuff sack (with a translucent diffuser) becomes a Lightbar™. Add a headlamp or two for soft illumination throughout the tent.
How it started
"When we decided to take on ultralight backpacking tents, I knew who I wanted to collaborate with—master tent maker Jake Lah.
Jake is the father of modern tent architecture, and his company DAC produces some of the best aluminum poles in the world.
Both of us are driven by producing something better than what’s already out there—and I think we’ve achieved that with our ultralight backpacking tents.
The Alto and Telos deliver exceptional height and space—and are loaded up with unexpected features like adjustable venting and our unique Hangout Mode. They are, quite possibly, the most livable ultralight backpacking tents out there."
-Roland Tyson, Founder & Head Designer at Sea to Summit
Design TypeSemi Freestanding
Door Count2 Doors / 1 Pole
Fabric - Canopy15-denier polyester mesh
Fabric - Floor15-denier ripstop nylon
Fabric - Rain Fly15-denier ripstop nylon; 1200mm hydrostatic head
Pole MaterialDAC Featherlite NFL 8.7mm and NSL 9.0mm
Season Rating3 Season
Frequently Asked questions
Is a footprint necessary with this tent?
Our Alto tent has a very light floor that's waterproof to 1200mm. It can be used on wet grass and undergrowth without a footprint, however, a footprint helps protect the tent floor from damage through abrasive surfaces and sharp objects.
What does 'semi-freestanding' mean?
Rather than needing to secure a tent with poles attached to every corner, a semi-freestanding tent may only need one pole to hold up the structure and reinforced with stakes at the corners. Semi-freestanding tents are lighter weight and have smaller packed-volume.
Our Alto tents have a lighter poleset than the Telos, but they need to have the corners staked out at the head end.
What are the differences between regular and plus models?
The Alto Plus tent has a nylon inside fabric with unzippable vents rather than mesh to keep cold air from getting into the inner tent. The Plus model also features a more waterproof floor (2500mm against 1200mm).
Will a 79" x 25" sleeping pad fit inside the tent?
You can squeeze a large rectangular sleeping pad into the Alto TR 1 tent, but it was primarily designed for ultralight backpackers who use smaller pads.
Is a tent worth the extra weight over a bivy shelter?
We think so! In addition to shelter, this tent gives you room to sit up, excellent ventilation (so almost no condensation), and a vestibule to store wet gear.