Yama Mountain Gear · Tents

Yama Mountain Gear 1P Cirriform DW

Name: Yama Mountain Gear 1P Cirriform DW
Brand: Yama Mountain Gear

Weight from

1.2 oz

Price from

$245

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Specs

Sleeps	1
Wall type	Double wall
Setup	Trekking pole
Floor dimensions	88 x 36 in (Bug Shelter)
Floor area	19.6 sq ft (Bug Shelter)
Peak height	42 in (Bug Shelter)
Packed weight	22.5 oz (637 g)
Packed size	~10.5 x 7 x 4 in (with Bivy)
Fly fabric	Recycled 20D Silpoly, ~1800 mm
Floor fabric	Recycled 20D Silpoly, PeU interior, ~2500 mm
Poles	Trekking poles (not included)

Description

The Cirriform, available with your choice of inner

This double-wall (DW) system pairs the 1P Cirriform with your choice of the 1P Bug Shelter or Y-zip Bug Bivy.

With Bug Bivy: 637g | 22.4 oz With Bug Shelter: 710g | 25.0 oz

Buying the system saves you money compared to buying the components separately. You'll also get an extra stuff sack big enough to fit both items, and we'll pre-install all the rigging for you.

NOTE: Closeout Cirriforms are available here. They had too much coating applied and are heavier than stock.

Description

Learn about the 1P Cirriform DW

At the end of a long day, setting up your shelter should feel straightforward and sure - fast to pitch, solid in wind and rain, and dependable as the light fades. Designed around real trail experience, the Cirriform DW pairs the Cirriform tarp with your choice of inner - the Y-Zip Bug Bivy or 1P Bug Shelter - for a modular, double-wall (DW) setup that's balanced, capable, and trustworthy.

Dual Entry
Convenient access from the side and front, with flexible pitching options.
Refined Geometry
Optimized floor plan and canopy shape balance usable space with a compact footprint.
Adjustable Pitch
Fine-tune height for greater coverage or increased airflow.
Wind Stability
Tapered profile and aggressive curvatures create a taut, wind-shedding pitch.
Modular System
Works seamlessly with either the Y-Zip Bug Bivy or 1P Bug Shelter.
Double-Wall Efficiency
Mitigates condensation while maintaining excellent ventilation.

Sitting in the open door of the Cirriform DW

Refined by Experience

Every curve, angle, and stitch of the Cirriform DW has been shaped by years of real trail use - by YAMA and by thru-hikers who've relied on it through wind, rain, and long miles. It's not about chasing the lowest weight; it's about making thoughtful choices that enhance performance, stability, and ease of use.

Dual entry

The dual-entry design offers side access for fair-weather convenience and front access for protection during poor weather or high condensation.

Adaptable and Modular

The Cirriform DW system lets you choose the setup that fits your needs:

Y-Zip Bug Bivy: Minimalist protection with the smallest footprint and lowest weight
1P Bug Shelter: Added room and flexibility for extended trips or variable conditions

Made in Vietnam and field-tested in Montana

Specifications

Weight

	With Bug Bivy	With Bug Shelter
Tarp	332g 11.7 oz	332g 11.7 oz
Inner	210g 7.4 oz	278g 9.8 oz
Rigging	67g 2.3 oz	70g 2.5 oz
Stuff sacks (3)	28g 1.0 oz	30g 1.0 oz
Total packaged	637g 22.4 oz	710g 25.0 oz

Packed size

	With Bug Bivy	With Bug Shelter
Complete system	~10.5" x 7" x 4" ~27cm x 18cm x 10cm	~10.5" x 7" x 5" ~27cm x 18cm x 13cm
Tarp alone: ~10" x 7.5" x 2" \| ~25.5cm x 19cm x 5cm

Inner dimensions

	Bug Bivy	Bug Shelter
Length	86" 218.5cm	88" 223.5cm
Height at head / front apex	23" 58.4cm	42" 107.0cm
Height at foot / rear apex	16" 40.6cm	22" 56.0cm
Width at head / front	34" 86.4cm	36" 91.5cm
Width at foot / rear	26" 66.0cm	28" 71.1cm
Tub depth	5" 12.7cm	8" 20cm
Floor area	n/a	19.6ft² 1.8m²
Packed size	~9" x 5.5" x 2" ~23cm x 14cm x 5cm	~11" x 7" x 2" ~28cm x 18cm x 5cm
Bug Shelter zipper: full width @ front, ~2/3 length along side, full height to apex.

Bug Bivy

Cirriform Tarp dimension drawings: top, side, rear and front views

Click to enlarge

Bug Shelter

Click to enlarge

Cirriform tarp dimensions

For overall dimensions of this tarp, please see the diagram which depict common dimensions for various pitches.

Click to enlarge

Materials

The Cirriform DW is made from durable, recycled 20D Silpoly - a lightweight fabric chosen for its reliable performance in outdoor environments.

Tarp	Recycled, 20D SilpolySilicone-based coating both faces; seams not taped
Floor	Recycled, 20D SilpolySilicone outer, PeU inner; taped seams
Canopy	Ultralight, no-see-um meshNylon

Detailed material specifications

Tarp: Recycled, 20D Silpoly

Silpoly absorbs less water than silnylon, reducing added weight, and lower sag ensures the tarp stays taut through the night.

Weight: 40-41 gsm | ~1.2 oz/yd²
Hydrostatic Head: ~1800mm
Outer face coating: Silicone-based
Inner face coating: Silicone-based
PFAS Free: Yes
Taped Seams: Not taped - Seam sealing is required
Color: Shark gray

Floor: Recycled, 20D Silpoly

PeU-coated on the interior for improved puncture resistance and reduced slipperiness.

Weight: ~45 gsm | ~1.23 oz/yd²
Hydrostatic Head: ~2500mm
Outer face coating: Silicone
Inner face coating: PeU
PFAS Free: Yes
Taped Seams: Yes
Color: Shark gray

Canopy: Ultralight, no-see-um mesh

Weight: ~17 gsm | ~0.5 oz/yd²
Material: Nylon
PFAS Free: Yes
Color: Black

Components:

Zipper: YKK, Size #3
Webbing: Recycled Nylon
Reflective webbing: Polyester

Required items (not included):

The items needed to pitch your shelter will vary depending on your approach.

Front Pole: About 44" - 45" (~111 - 114 cm) when pairing with the Bug Shelter or 39" - 42" (~99 - 107cm) when pairing with the Bivy
Rear Pole: At least 31" (~79cm) when pairing with the Bug Shelter or at least 26" (~66cm) when pairing with the Bivy
Stakes: 6 (8 for better wind stability)
Rigging: If you plan to pitch the inner on its own (not under the Cirriform), you will need additional guyline or our Stand-alone rigging kit. If using tent poles or trekking poles without baskets, you may also need two of our guyline grommets (not needed with stand-alone kit).

Notes/FAQ:

Do I need a groundsheet? A groundsheet is not required, but using one will help extend the life of any floor.
Do I need to seal the seams? Tarp seams should be sealed using a sealer for silicone coated fabrics (we recommend Seam Grip +SIL by Gear Aid). Optional seam sealing service available. Floor seams are factory-taped and don't require sealing.
Color of the large stuff sack may not match color of shelter.

Pitching

How to pitch

Start by staking out the corners of the tarp to establish your base. Raise the poles at the peaks and stake them to form the shelter's shape. Adjust and tension the lines evenly for a tight, balanced pitch. Once the outer is secure, attach the inner by clipping the corners and apexes to the tarp. When breaking camp, leave the inner and outer connected so your shelter is ready for a quick, seamless setup next time.