Sea to Summit Aeros Ultralight Pillow
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Aeros Ultralight Pillow
Sleep System · Thru-Hiking · Ultralight
Ultralight, compact, and comfortable, the Aeros Ultralight Pillow uses soft, brushed recycled fabric and a contoured shape that fits inside sleeping bag hoods. Its scalloped base and included PillowLock System patches keep it securely in place all night. The mini XPRESS valve enables fast inflation and adjustable firmness of its extra-thick 11cm height for personalised support. Made with durable, hydrolysis-resistant TPU, it packs to the size of an egg — ideal for fast and light adventures.
Egg-Sized Pack
Packs to 3 × 3 × 3 in (Regular) — about the size of an egg. Smaller than any other Aeros pillow.
Lightest Camp Pillow
1.9 oz / 54 g (Regular) — the lightest camp pillow in the Aeros family, lighter than the Down (2.5 oz) and Premium (3.5 oz).
Adjustable Firmness
Mini XPRESS valve — 3–4 breaths to inflate, release air to soften. Up to 11cm adjustable height.
Anti-Slip
3M™ PillowLock System patches stick the pillow to your sleeping mat — no 3am pillow hunts.
Hood-Compatible
Regular size fits perfectly inside the hood of technical sleeping bags — premium for cold-weather camping and mountaineering.
Eco-Certified
Made with RCS-certified recycled polyester fabric — third-party verified recycled content.
Egg-Sized Packed Volume
The Aeros Ultralight's headline feature — the Regular size packs down to 3 × 3 × 3 in (about the size of an egg). Smaller than any other Aeros pillow (Down is 4×2×2, Premium is 4×3×3, Traveller is 4×3×2). Designed for thru-hikers, bikepackers, and ultralight backpackers who count every cubic inch of pack space.
Soft Brushed Recycled Face Fabric
The upper pillow surface is a soft, brushed recycled polyester with TPU coating — comfortable against the skin, durable enough for daily camp use, and built to the RCS (Recycled Claim Standard). The brushed texture adds next-to-skin comfort without adding weight.
Contoured Shape with Scalloped Base
The pillow has a contoured shape with a scalloped base (vs the Premium's scalloped edges) — designed to cradle the head and stay centred on the mat. The scalloped base means the pillow settles naturally into the curve of your shoulder and doesn't slide forward when you lie on your back.
Hydrolysis-Resistant TPU Air Chamber
Internal air chamber is built from TPU polyether laminate — engineered to resist hydrolysis (chemical breakdown of TPU when exposed to humidity over time). Resists the brittleness and cracking that kills cheaper TPU bladders after 2–3 years of storage. Built for years of thru-hike season after thru-hike season.
Mini XPRESS Valve
Sea to Summit's ultralight inflation valve — one-way intake that opens on the inhale (no air escaping back out) and a wide-deflation port for fast pack-down. Same valve as the Aeros Down Pillow. Small profile keeps weight down.
Up to 11cm Thickness
Maximum loft of 11cm (~4.3") — slightly thinner than the Aeros Down and Premium (both 12cm), saving weight while still providing comfortable head support. Adjustable via the XPRESS valve — inflate fully for firm or partially for soft.
3M™ PillowLock System
Included PillowLock System patches are adhesive silicone dots that stick to the bottom of the pillow and the surface of most camping sleeping mats. Once applied, the patches grip the mat and prevent the pillow from sliding off during sleep. Since 2019, all Sea to Summit pillows use the PillowLock System — patches are reusable: peel, wash, reapply. Compatible with most nylon, polyester, and synthetic sleeping mat surfaces.
Sleeping Bag Compatibility
Regular Size Fits Inside Sleeping Bag Hoods
The Regular-sized Aeros Ultralight fits perfectly inside the hood of technical sleeping bags (per STS FAQ). Larger sizes may not fit into the hood but can still be used for support and comfort. Hood-compatibility matters most for cold-weather camping, mountaineering, and bikepacking where you want pillow support inside a mummy-style bag.
Ultralight Class
Sea to Summit's "Weight" performance scale rates this pillow as Ultralight — the lowest weight tier. At 1.9 oz / 54g (Regular), it's the lightest pillow in the entire Aeros family. Per STS FAQ: "Aeros Ultralight camping pillows are even lighter and pack smaller than the Aeros Premium versions."
Ultra Compact Class
Sea to Summit's "Packability" scale rates this pillow as Ultra Compact — the smallest packed-volume tier. At 3 × 3 × 3 in (Regular), it packs smaller than a deck of cards. Thru-hikers and bikepackers prioritize this metric above all else.
Regular / Large (2 sizes only)
Only two sizes — no XL like the Aeros Down and Premium. Regular (13 × 10 × 4") is the most packable and fits inside a sleeping bag hood. Large (18 × 12 × 5") adds surface area for restless sleepers or those who want more head support.
Best Use
Activity
Backpacking, Bikepacking, Thru-Hiking
Materials & Construction
Top Fabric
100% Polyester with TPU coating (brushed recycled, RCS-certified)
Base Fabric
100% Nylon with TPU
Air Bladder
100% Thermoplastic Polyurethane (TPU) — polyether laminate, hydrolysis-resistant
Valve
TPU body with Silicone flap (mini XPRESS valve)
Stuff Sack
100% Polyester (included)
Recycled Content
Low-impact certified recycled polyester fabric (RCS Recycled Claim Standard)
Dimensions & Weight (by size)
| Measurement | Regular | Large |
|---|---|---|
| Weight | 1.9 oz / 54 g | 2.8 oz / 79 g |
| Packed Weight | 2.0 oz / 57 g | 3.0 oz / 85 g |
| Packed Size | 3 × 3 × 3 in 7 × 6.5 × 6.5 cm |
4 × 3 × 3 in 10 × 7 × 7 cm |
| Inflated Dimensions | 13 × 10 × 4 in 34 × 26 × 11 cm |
18 × 12 × 5 in 46 × 30 × 12 cm |
Performance (Sea to Summit scales)
Weight Class
Ultralight (lowest tier — lightest in Aeros family)
Packability
Ultra Compact (smallest tier — egg-sized when packed)
Max Thickness
11cm (~4.3") — slightly thinner than Down/Premium's 12cm
Compatibility
Sleeping Mats
Compatible with most camping mats with fabric or textured surfaces — nylon, polyester, brushed polyester, microsuede. Not compatible with silicone-treated or waterproofed mat surfaces.
Sleeping Bags
Regular size fits inside the hood of technical sleeping bags. Larger sizes don't fit in hoods but work outside the bag for support.
Inflation Accessory
Sea to Summit Airstream Pump (sold separately) — turn inside-out to inflate the pillow
Use Cases
Thru-hiking, long-distance backpacking, bikepacking, ultralight camping, fast-and-light adventures
Profile
Brand
Sea to Summit (Australian outdoor gear, founded 1994)
Category
Camp Pillow / Sleep System
Activity
Backpacking, bikepacking, thru-hiking, ultralight camping
Season
Year-round (all seasons)
Cleaning (per Sea to Summit FAQ)
Hand wash only — not machine washable. Close the valve before cleaning, use warm water with a gentle kneading motion (don't scrub aggressively, can damage the TPU seams and stress the welded seams), and allow to air dry completely. Do not use a dryer — heat can damage the TPU air chamber, warp the welded seams, and weaken the brushed polyester face fabric. For surface stains, a small amount of technical wash (like Nikwax Tech Wash) is preferable to regular soap.
Drying
Air dry only. After any cleaning or exposure to moisture, fully deflate the pillow and hang or lay flat in a well-ventilated area. Ensure the brushed polyester face fabric is completely dry before long-term storage. Do not tumble dry or expose to direct high heat.
Inflation & Deflation
To inflate: open the mini XPRESS valve, blow into the port (one-way intake flap lets air in without escaping), 3–4 breaths fills a Regular-sized pillow. To deflate: flip the valve cap to the deflation position — the wide port vents air rapidly. Always close the valve fully before use to prevent slow leak drift. Pro tip from Sea to Summit: turn the Airstream Pump from your Sea to Summit sleeping mat inside-out and use it to inflate the pillow — eliminates breath-moisture buildup inside the TPU chamber (which can degrade TPU over years of use).
Valve Care
Keep the mini XPRESS valve free of sand, dust, and debris — small particles can prevent the one-way silicone flap from sealing properly, causing slow deflation overnight. If the valve sticks or doesn't hold air, check for debris and rinse with clean water. Do not use lubricants on the valve mechanism — they can attract dirt and gum up the sealing surfaces.
Air Chamber Pressure
The TPU air chamber is designed for breath or pump inflation — do not use compressed air or over-pressurize. Over-inflation stresses the welded seams. You'll feel when the chamber is full — firm but not hard. If the chamber feels tight or looks stretched, release some air until it yields slightly under hand pressure.
Hydrolysis Resistance (NEW — IMPORTANT)
Standard TPU air bladders can break down via hydrolysis — a chemical reaction with humidity that makes the TPU become brittle and crack over time, often after 2–3 years in storage. This pillow's TPU polyether laminate is hydrolysis-resistant, meaning the chamber maintains flexibility and air-tightness for years longer than standard TPU. To preserve this: store deflated and dry, don't leave inflated for weeks on end, and avoid prolonged exposure to direct heat.
3M™ PillowLock Patches
The PillowLock patches are reusable silicone adhesive dots. To maintain grip: peel the patches off the mat and pillow bottom, rinse with clean water, air dry, and reapply. Adhesive performance diminishes over time as the silicone surface picks up dust and oils — replacement patches are available from Sea to Summit or 3M. Apply patches to a clean, dry pillow bottom for best adhesion.
Brushed Recycled Polyester Face Care
The brushed recycled polyester face fabric can pill over time with heavy use (small fiber balls form on the surface) — a fabric shaver can remove pilling without damaging the brushed texture. Avoid contact with Velcro (the hooks can catch and tear the knit) — keep separate from packs and clothing with Velcro closures. The TPU coating on the fabric adds water resistance but isn't fully waterproof — submerging can allow water to seep through the seams.
Long-Term Storage
Store fully deflated in a loose shape inside the included stuff sack — do not compress tightly. The TPU chamber can take a set if stored compressed, which may affect its ability to hold air. Before first use after long storage, always test inflation and check for slow leak by inflating and leaving overnight.
Puncture Repair
The TPU air chamber can be repaired with a Sea to Summit TPU repair patch (sold separately) or any TPU/polyurethane repair tape. Clean and dry the puncture area, apply the patch, and allow to cure fully (usually 12–24 hours) before re-inflating. Do not use silicone-based sealants on TPU — they won't adhere properly. Deep punctures or seam failures are not repairable and the pillow should be replaced.
Thru-Hiking Tip
The Aeros Ultralight is built specifically for thru-hikers — the egg-sized pack (3×3×3 in) disappears into a pack's outer pocket, and 1.9 oz / 54g is barely noticeable. For PCT, AT, CDT, or other long-distance trails where every gram and cubic inch matters, this is the lightest pillow in the Aeros family. The brushed polyester face fabric handles day-after-day use better than lighter materials.
Shipping Policy
Components:
All component items (wheels, drivetrains, suspension, brakes, etc.) ship within 2-5 business days of purchase.
Bicycles:
Complete bikes typically ship within 2–3 weeks due to build, tuning, and inspection times. You will receive tracking information as soon as your order is ready to ship.
Riding Gear & Apparel:
Riding gear and apparel orders (helmets, jerseys, gloves, etc.) ship within 2-5 business days.
Returns & Exchanges:
If you received the wrong size or wish to exchange an item, it must be returned in original condition—unused, uninstalled, and with all packaging intact.
For full details, please see our Refund Policy before initiating a return.
