Open-cell foam core self-inflates when valve opens. Add a few breaths to dial in firmness.

4 cm / 1.57 in loft with adjustable firmness for any sleep style.

Air Zone construction puts foam + insulation where you need it, not where you don't.

ASTM R-Value 4.2 covers warm weather through cold shoulder seasons.

Certified recycled 75D woven polyester face fabric — durable, abrasion-resistant, sustainable.

Side-loading stuff sack + XPEL valve = tighter rolls and faster packing.

Air Zone is STS's body-mapped foam + insulation layout — thicker foam under the torso (where your weight sits), thinner/hollowed sections where you don't need support (legs, edges). How it works: - Foam thickness is calibrated to body parts — thicker where you compress most - Hollow zones in low-priority areas reduce weight without sacrificing comfort - Insulation layered to match — warmer where you sleep, lighter elsewhere Result: A mat that sleeps like a thicker mat but weighs less than uniform foam would. Same technology as the Camp Plus — the difference is overall thickness (4 cm vs 7 cm).

The mat uses open-cell polyurethane foam as its core. When the valve is open, the foam draws air in like a sponge — cells expand and pull air through the valve automatically. Inflation steps: 1. Unroll the mat, valve open 2. Wait 5-10 minutes — foam self-inflates to ~80% capacity 3. Add 2-4 breaths of mouth air to dial in firmness 4. Close valve Deflation steps: 1. Open valve fully (XPEL valve enables faster deflation) 2. Press flat from foot end toward valve end 3. Roll tightly (the contour shape allows tight rolls) 4. Insert into stuff sack via the wide side-loading opening 5. Compress stuff sack to expel remaining air Why "self-inflating" + breath: foam cells can only draw so much air before backpressure stops them. A few breaths top it off to your preferred firmness.

At 4 cm / 1.57 in, the Camp is thinner than the Camp Plus (7 cm) but offers full adjustable firmness via inflation: Firmness by preference: - Back sleepers: medium-high firmness (full inflation + a few breaths) - Side sleepers: medium firmness (less air = more give at hips/shoulders) - Stomach sleepers: firm (full inflation) 4 cm trade-off: thinner than 7 cm mats, so side sleepers feel more ground pressure at hip/shoulder (the bony points). Best for back/stomach sleepers or those who prioritize portability. Side sleepers who want comfort should look at the Camp Plus or 5+ cm mats. Vs higher R-Value mats: the open-cell foam in SI mats compresses under weight — the more you sink, the closer to ground. Heavier sleepers will sink to ~half the loft (still functional but thinner feel).

Contour Shape is STS's width-efficient rectangular shape — adds 12% more sleep area than a standard mummy-cut mat. Compare to mummy shape: - Mummy mats taper at the foot — saves weight but constrains sleep positions - Contour Shape keeps near-full width across the entire length - 12% more usable area without going to a full rectangular Why this matters: - Side sleepers can shift positions without falling off - Active sleepers have room to move - Tighter than full rectangular = less bulk, less material, slightly lighter Versus Rectangular Wide / Rectangular: full-rectangular = even more sleep area, more material, more weight. Contour is the best balance of space and packability.

The Camp comes in two shape styles: Contour Shape (Regular + Large): - Slightly tapered ends - 12% more area than standard mummy - Lighter weight - Most efficient pack size Rectangular (Regular Rectangular Wide + Large Rectangular): - Full rectangular, no taper - Maximum sleep area - Heavier weight (more material) - Wider/larger pack size Choose Contour if: best space-to-weight ratio, mostly back/stomach sleepers, limited pack space, entry-level backpacking. Choose Rectangular if: restless sleepers, side sleepers who extend legs/arms off the edge, prioritise maximum sleep area over pack size.

XPEL is STS's multi-function valve designed for sleeping mats: Functions: - Inflate — open for self-inflation, add breaths for firmness - Deflate — opens wide for fast air release - Compact deflation — flattens the foam to enable tighter rolls than standard valves Compatible with pump sacks: the Airstream Pump Sack (STS951) connects directly to this valve for inflation without breath moisture. Quick tip: when packing, open valve fully + press foam flat before rolling. The XPEL allows more air out per press than standard valves = smaller packed size.

The included stuff sack loads from the side (not the end): Why side-loading: - Easier to slide the rolled mat in - Doesn't fight the roll direction - Allows compression while mat is inside - Faster pack-up Stuff sack material: 100% Polyester — durable, lightweight. Tip: fold the stuff sack flat inside the mat when packing for ultra-compact storage.

The mat's outer fabric is 75 denier woven polyester with TPU lamination: - 75D = mid-weight denier — tough enough for car camping, ground abrasion, dog claws, sharp sticks - Woven (vs knit) = high tensile strength, low stretch, dimensionally stable - Recycled = certified recycled content (sustainability) - TPU lamination = the airtight layer bonded to the inside Why 75D (vs lighter pads like 20D Pursuit Plus): - 75D resists punctures, abrasion, rough ground - For car camping, entry-level backpacking, paddling — durability matters - Heavier face fabric = longer product life - Trade-off: heavier than ultralight mats (worth it for most users) Same 75D fabric as the Camp Plus (which uses a thicker 7 cm core). The Camp is a lighter, more portable option for entry-level use.

R-Value measures a mat's resistance to heat flow (insulation from cold ground). The Camp is rated R-Value 4.2 under ASTM F3340 — the industry-standard testing protocol. What R-Value 4.2 means in practice: - Spring/Summer/Fall three-season camping — comfortable - Cool nights (50°F / 10°C) — fine - Cold nights (40°F / 4°C) — adequate with a 3-season bag - Below 40°F / 4°C — getting cold; consider Camp Plus or supplement - Freezing (32°F / 0°C) — borderline; pair with foam pad underneath ASTM F3340 standardization: all major mat brands now test to this standard, so you can directly compare across brands (Therm-a-Rest, Big Agnes, Nemo, Exped, STS). Cold sleepers (women run colder, side sleepers compress insulation): should err on the side of higher R-Value — Camp Plus (5.3) or pair with foam pad underneath for cold.

Per STS, the Camp is best for Camping, Entry-level backpacking, Paddling — the lighter entry-level mat in the STS lineup. Great for: - Car camping (light enough to ignore weight) - Entry-level backpacking (840g Regular is reasonable for shorter trips) - Canoe / kayak camping - Overlanding / van life - Cabin trips with friends who appreciate comfort - Family camping on a budget - First-time mat buyers NOT ideal for: - Multi-day backpacking where weight matters most (Pursuit Plus is lighter) - Alpine / mountaineering (not warm enough, not light enough) - Winter camping alone (R-Value 4.2 borderline) - Bikepacking (the 4 cm doesn't pack as small as inflatable mats) Compromise: for serious backpacking → Pursuit Plus (lighter). For cold-weather camping → Camp Plus (warmer + thicker).

Two STS self-inflating mats — Camp Plus is the upgraded version: | Aspect | Camp | Camp Plus | |---|---|---| | Price (Regular) | $89.00 | $99.00 | | Price (Large Rect) | $99.00 | $109.00 | | Thickness | 4 cm / 1.57 in | 7 cm / 2.76 in (75% thicker) | | R-Value | 4.2 | 5.3 (warmer) | | Best Use | Camping, Entry-level backpack, Paddling | Camping, Car camping, Hunting, Paddling (NOT backpacking) | | Weight (Regular) | 840 g / 29.6 oz | 1050 g / 37.0 oz (210g heavier) | | Weight (Large Rect) | 1180 g / 41.6 oz | 1495 g / 52.7 oz (315g heavier) | | Construction | Air Zone (body-mapped) | Air Zone (body-mapped) | | Face Fabric | 75D recycled polyester | 75D recycled polyester | | Valve | XPEL | XPEL | | Stuff Sack | Side-loading | Side-loading | | Shape Options | Contour + Rectangular | Contour + Rectangular | | Temperature Range | Three-season | Extended three-season to borderline winter | Same: brand, materials, valve, sack, shape options, recycled fabric, Air Zone construction, ASTM F3340 testing. Different: thickness (+3 cm in Plus), R-Value (+1.1 in Plus), weight (~25% heavier Plus), Best Use (Camp = backpacking-friendly, Plus = camping focus), price (+$10). Choose Camp for: - First-time buyer / budget-conscious - Entry-level backpacking (840g Regular is backpackable) - Lighter pack weight matters - Warmer weather camping Choose Camp Plus for: - Side sleepers who want more cushioning (7 cm helps) - Cold-weather camping (R-Value 5.3) - Car camping / basecamp (weight doesn't matter) - Hunting, late-season camping - Want thicker comfort Or buy BOTH for couples/families: Camp for backpacking trips, Camp Plus for basecamp/auto trips.

Two STS self-inflating mats — Pursuit Plus is the lighter backpacking alternative: | Aspect | Camp | Pursuit Plus | |---|---|---| | Construction | Air Zone (body-mapped) | Air Light (lighter overall) | | Face Fabric | 75D (durable, heavier) | 20D (lighter, less durable) | | R-Value | 4.2 | Lower (~3-4 range) | | Weight (Regular) | 840 g / 29.6 oz | ~600-700 g (lighter) | | Best Use | Camping, Entry-level backpack, Paddling | Backpacking, faster trips | | Thickness | 4 cm | Similar 5-6 cm | Choose Camp for: durability, warmth, daily use. Heavier but tougher. Choose Pursuit Plus for: lighter weight on the trail. Less durable, less warm. Other STS mat lines (Air Sprung Cell — ultralight): Ethos, UltraLight, Camp Air — these are not self-inflating, they use inflatable air chambers with no foam.

Airstream Pump Sack (STS951) — $34.95: inflate without breath (dry inflation). Connects directly to XPEL valve. Useful in cold weather when breath moisture would otherwise condense inside the mat. Air Chair (STS955) — $39.95: turns the mat into a camp chair with folding + buckles. Compatible with all STS Air Sprung Cell mats + most Self-Inflating mats (this is one of those). Foam Core Pillow — $29.95: foam pillow that pairs with STS mats — sized for use on top of any STS mat.