What Fabric Is Fleece? Types, Uses, and Care Tips

Posted by BLG on 2026 Jul 21st

What Fabric Is Fleece? Types, Uses, and Care Tips

Technician inspecting polyester fleece fabric

Fleece is a synthetic fabric made primarily from polyester fibers, engineered to trap body heat through a raised, brushed surface that creates millions of tiny air pockets. It mimics wool’s warmth without the weight, itchiness, or slow drying time. Most fleece you encounter today is knitted, not woven, which gives it a natural stretch and a soft, fuzzy texture on one or both sides.

Here is what defines fleece at a glance:

Primary material: Polyester (sometimes blended with cotton or spandex)
Structure: Knitted fabric with a mechanically brushed pile surface
Key properties: Warm, soft, lightweight, moisture-wicking, and quick-drying
Common forms: Polar Fleece, Microfleece, Sherpa Fleece, Cotton-Blend Fleece
Typical uses: Jackets, base layers, blankets, activewear, and casual clothing

How fleece fabric is made and what it contains

Polyester is the backbone of most fleece. The fiber starts as petroleum-derived plastic, extruded into fine filaments and spun into yarn. From there, the yarn goes onto a circular knitting machine in a terry knit configuration, where loops are interlooped to build the fabric’s base structure. That base is then run through a mechanical brushing process called napping, which breaks the yarn loops and lifts the fibers into a soft, dense pile. That pile is what gives fleece its characteristic fuzziness and its ability to trap warm air close to your skin.

Cotton-blend fleece follows a different path. Instead of pure polyester, it combines cotton with a synthetic fiber, usually polyester or spandex, to create a fabric that feels softer against bare skin but behaves quite differently in performance terms. Cotton fleece retains moisture longer and loses heat faster than its polyester counterpart, which matters a lot if you are hiking in the rain versus lounging at home.

Key production steps for synthetic polyester fleece:

Petroleum-derived plastic is melted and extruded into fine polyester filaments
Filaments are spun into yarn and loaded onto circular knitting machines
Terry knit construction creates a looped base fabric with inherent stretch
Mechanical brushing (napping) breaks loops and raises fibers into a soft pile
Optional finishing treatments, such as anti-pill or water-resistant coatings, are applied

Pro Tip: Check the fabric label before buying. “100% polyester fleece” performs better in wet or cold outdoor conditions, while “cotton-blend fleece” is the better pick for everyday comfort and breathability in mild weather.

Infographic showing fleece fabric guide with definition, types, uses, care tips, impact

What makes fleece fabric so practical to wear

Fleece earns its place in outerwear and activewear because of a specific combination of properties that few other fabrics match at the same price point. The brushed pile traps air, and air is an excellent insulator. That is the same principle behind wool, but fleece does it with far less weight and without the scratchy feel.

Woman wearing red fleece jacket outdoors

Fleece holds less than 1% of its weight in water, making it highly hydrophobic compared to cotton or wool. Moisture moves through the pile rather than soaking in, which is why a fleece mid-layer keeps you warm even when you are sweating. The catch: once fleece becomes fully saturated, those air pockets fill with water and insulation drops sharply. Fleece is not waterproof or windproof on its own without a membrane or coating.

Core properties at a glance:

Warmth-to-weight ratio: High, due to air trapped in the brushed pile
Moisture management: Wicks sweat away from skin; dries quickly
Softness: Mechanically brushed surface is gentle against skin
Breathability: Polyester fleece breathes well, especially at lighter weights
Stretch: Knitted construction gives natural two-way or four-way stretch
Durability: Resists shrinking and holds shape through repeated washing

Cotton-blend fleece is more porous and breathable in mild conditions, but it absorbs and holds moisture, making it a poor choice for high-output outdoor activities where staying dry matters.

The main types of fleece fabric you will find

Fleece is a family of fabrics, not a single material. Each type has a distinct texture, weight, and best use case.

Polar Fleece: The original and most recognized type, developed by Malden Mills and Patagonia in 1979 as Synchilla. It has a two-sided pile, excellent warmth, and is the standard choice for outdoor jackets and mid-layers.
Microfleece: The thinnest and most breathable option, typically 100 GSM or below. It layers easily under a shell jacket and works well for high-output activities where overheating is a risk.
Sherpa Fleece: Designed to mimic the look and feel of shearling. One side is smooth, the other has a thick, curly pile. Common in jacket linings, vests, and cozy home textiles.
Cotton-Blend Fleece: The fabric behind most sweatshirts and casual hoodies. Softer against bare skin than pure polyester, but heavier and slower to dry. Not suited for serious outdoor use.
Coral Fleece and Minky Fleece: Softer, finer-pile variants used primarily in blankets, baby products, and home textiles rather than performance apparel.

The type you need depends almost entirely on what you are making or buying it for. Polar Fleece for a hiking jacket, Sherpa for a cozy blanket, Microfleece for a running base layer.

Where fleece fabric gets used most

Fleece shows up across a wide range of products, from technical outdoor gear to everyday home items. Its versatility comes from the fact that different weights and constructions can be tuned for very different end uses.

Fleece blankets and slippers in cozy home

Polar fleece garments include jackets, hats, sweaters, sweatpants, hoodies, pajamas, gym clothes, and high-performance outdoor clothing. Beyond apparel, fleece is a go-to for blankets and throws, where its softness and warmth make it an obvious choice. You will also find it in cloth diapers, pet beds, and craft projects.

Common applications by category:

Outerwear: Fleece jackets, vests, and pullovers as standalone layers or mid-layers under a shell
Activewear: Base layers and mid-layers for hiking, skiing, and running in cold conditions
Casual clothing: Sweatshirts, joggers, and hoodies, typically in cotton-blend fleece
Home textiles: Throws, blankets, and pillow covers, often in Sherpa or Coral Fleece
Performance gear: Technical mid-layers in Polartec or similar branded performance fleece

If you are shopping for apparel fabric types and want to understand how fleece fits alongside other textile options, the weight and construction of the fleece matters as much as the fiber content.

How to wash and care for fleece without ruining it

Fleece is easy to care for, but a few habits will keep it performing well for years. The pile is the most vulnerable part. Harsh washing conditions mat the fibers down, and fabric softeners coat them in a way that reduces moisture-wicking performance.

Proper care means washing in cold water on a gentle cycle, skipping fabric softener entirely, and either tumble drying on low heat or air drying flat. High heat is the fastest way to damage the pile and cause pilling.

Practical care checklist:

Wash cold, gentle cycle: Protects the pile and prevents matting
No fabric softener: Softener clogs the fibers and kills moisture-wicking ability
Low heat or air dry: High heat melts polyester fibers and degrades the pile
Wash inside out: Reduces friction on the outer surface and slows pilling
Wash separately or with similar fabrics: Lint from other fabrics sticks aggressively to fleece pile
Use a mesh laundry bag: Reduces microfiber shedding into your washing machine drain

Fleece weights, breathability, and environmental impact

Fleece weight, measured in grams per square meter (GSM), is the single most useful spec for choosing the right fleece for a given activity. Weight categories range from less than 100 GSM (Microfleece), 100-weight, 200-weight, to above 300 GSM (Heavyweight) for maximum insulation in static cold-weather conditions. Heavier fleece is warmer but less breathable. Lighter fleece breathes better but provides less insulation on its own. Understanding this trade-off is the key to picking the right fabric weight for your project or purchase.

Microfiber shedding is the main environmental concern with synthetic fleece. Every wash cycle releases tiny polyester fibers that pass through most wastewater treatment systems and end up in waterways. Polartec’s Shed Less Technology addresses this directly, and other advanced fleece brands use specialized finishes with similar goals. Using a mesh laundry bag and washing less frequently also reduces shedding meaningfully.

Key guidance on weights and sustainability:

Under 100 GSM (Microfleece): Best breathability, ideal for active layering and high-output use
100-weight: Light insulation, good for mild conditions or as a base layer
200-weight: The most versatile mid-layer, balancing warmth and breathability
300-weight: Maximum warmth for cold, low-activity use; not ideal for aerobic activity
Sustainability tip: Choose fleece with anti-shed finishes and wash in a mesh bag to cut microplastic release

Key Takeaways

Fleece is a polyester-based knitted fabric whose brushed pile traps air for warmth, making it one of the most practical cold-weather materials available at any price point.

Point	Details
Primary material	Most fleece is made from polyester fibers, sometimes blended with cotton or spandex.
How warmth works	Mechanical brushing creates a raised pile that traps air pockets, delivering insulation without bulk.
Weight determines use	GSM categories range from less than 100 (Microfleece), to above 300 (heavyweight), each suited to different activity levels.
Cotton-blend behaves differently	Cotton-blend fleece retains moisture and loses heat faster, making it better for casual wear than outdoor performance.
Care preserves performance	Cold water, no fabric softener, and low heat drying protect the pile and maintain moisture-wicking ability.