The Ultimate Fleece Guide

What is a Fleece? 

Typically made from synthetic fibres like polyester, fleece is a soft, warm and lightweight fabric commonly used for layers in cold-weather clothing.  

At Sherpa, we use recycled polyester in our fleeces which is made from post-consumer plastic through an innovative process of cleaning, melting and spinning plastic into new fibres, making it a sustainable and high-performance option for outdoor and everyday wear. 

What is sherpa fleece? 

Sherpa fleece is a type of fleece fabric known for its soft, wool-like texture and excellent warmth-to-weight ratio. With a fluffy, high-pile surface that feels plush and cosy, it’s designed to replicate the insulating qualities of sheep's wool while remaining lightweight and easy to care for. Ideal for linings, jackets and everyday comfort, Sherpa fleece offers that extra touch of warmth and softness perfect for winter layering.

How does fleece keep you warm

Recycled polyester fleece is designed to trap heat as its lofted structure creates tiny air pockets that retain body warmth while still allowing moisture to escape. This balance makes recycled polyester perfect for a fleece that is great for both high energy activities and for slow, frosty mornings. 

We offer three different weights of fleece, each offering a different level of warmth, breathability and movement to make your layers work for you.

Understanding fleece weight

Fleece weight refers to the density of the fabric, measured in grams per square metre (gsm). The higher the gsm, the thicker and warmer the fleece will be. A 100-weight fleece is lightweight and breathable, 200-weight offers balanced warmth for everyday wear, and 300-weight provides maximum insulation for colder conditions. While it indicates warmth and thickness rather than overall garment weight, understanding fleece weight helps you choose the right layer for your activity and comfort needs.

100 weight fleece

Perfect for a lightweight midlayer, our 100 weight fleece is breathable, flexible and ideal for activities like hiking, running or cycling in the cooler months. Offering enough warmth without being too restrictive, it is ideal for layering under jackets and outerwear, perfect for outdoor adventures or cozy walks. 

Best for: Active adventures, transitional seasons and flexible layering. 

200 weight fleece

This is the best for an all-purpose midlayer. 200 weight provides noticeable warmth whilst still being breathable and easy to move around in. This works best layered under a jacket or on its own on dry, crisp cooler days. 

Best for: Everyday winter wear, hikes in chilly weather, layering under outerwear. 

300 weight fleece 

When warmth is the top priority, go for the heavyweight 300 weight fleece. Best used in cold, dry conditions or low-output activities and offering excellent insulation, the bulkier design makes it ideal for casual outdoor use when you need to keep warm. 

Best for: Much colder conditions, low-exertion activities, added insulation.

Fleece in winter apparel – How to layer a fleece: 

The key to staying warm outdoors isn’t about wearing the thickest clothing, it’s about being smart with layers, here’s how our fleece fits into that.  

• Base layer: Use 100 weight fleece or a t-shirt to regulate your temperature. 
• Midlayer: Using a 200 weight fleece to trap in the warmth whilst still being breathable and flexible. 
• Outerlayer: For cold, dry conditions, a 300 weight fleece is the perfect choice to help block out the cold and retain the warmth. 

This system allows you to adapt easily to changing conditions while staying warm, and comfortable throughout your adventures, whether that’s a long hike or a morning stroll. For more layering tips, read our guide on layering here. 

The sustainable choice: 

Opting for a recycled polyester fleece instead of virgin materials is a smart performance choice and great step towards a more sustainable wardrobe. 

Using recycled polyester helps reduce plastic waste as the plastic gets repurposed into high-performance fabric and still performs the same as traditional fleece. It is soft, durable and insulating. 

Fleece care and maintenance: 

Caring for recycled polyester fleece is important to get the most from your fleece, here are some good tips to follow: 

• Always pay attention to the care label 
• Wash cold to preserve the fibers 
• Skip fabric softeners as they can harm the breathability and moisture-wicking properties of your fleece 
• Air dry or tumble dry low to prevent shrinkage and maintain softness 

Conclusion and final tips

Recycled polyester fleece is more than just a cosy layer - it’s a performance-driven, environmentally responsible choice for winter adventurers. Whether you're reaching for a 100-weight fleece to climb frosty hillsides or layering a 300-weight for deep winter warmth, there’s a fleece for every season and occasion.