Which zip do I need? It's a question we're asked regularly at Point North Profabrics, and with good reason. From clothing and bags to boat covers and outdoor equipment, different projects require different types of zip – and choosing the wrong one can be frustrating.

Whether you're replacing a broken zip, making something from scratch or simply trying to understand the options available, this guide will help. We'll explain the main zip types, where they're commonly used and what to consider when choosing the right zip for your project.

Understanding the Different Types of Zip

There are several zip formats available, each designed for different applications.

Open-End Zips

Open-end zips are the zips most commonly found on jackets and coats. They separate completely and reconnect using a box-and-pin mechanism at the bottom. This allows the two sides of the zip to come apart entirely when opened.

Closed-End Zips

Closed-end zips remain permanently joined at one end, preventing the zip from separating completely. They're commonly used on pockets, bags, cushions and half-zip garments.

One-Way and Two-Way Zips

As well as open-end and closed-end designs, zips can also be described as one-way or two-way.

A one-way zip uses a single slider and operates from one end. A two-way zip uses two sliders, allowing the zip to be opened from either direction. You'll often find two-way zips on longer coats, sleeping bags, luggage and specialist outdoor equipment where additional flexibility is useful.

Zip by the Metre UK

Continuous zip, often referred to as zip by the metre, is supplied on a roll and cut to the required length.

This makes it ideal for:

• Sports bags
• Storage bags
• Pockets
• Cushions
• Covers
• Custom-made equipment

This makes it particularly useful for custom projects where standard zip lengths may not be suitable.

Moulded Chain vs Coil Zips

Choosing the correct chain type is often more important than choosing the length.

Moulded Chain Zips

Moulded chain zips feature interlocking moulded teeth and are generally the strongest zip construction available.

They're commonly used for:

• Boat covers
• Marine canopies
• Caravan awnings
• Heavy-duty outdoor covers
• Tents

Coil Zips

Also known as spiral zips, coil zips are more flexible and better suited to projects requiring curves.

They're frequently used for:

• Clothing
• Bags
• Lightweight outdoor equipment
• Curved tent openings

What Are Waterproof Zips?

Waterproof zips are designed to help prevent water penetration through the zip opening.

Unlike standard zips, they typically feature:

• Water-resistant coatings
• Concealed zip constructions
• Enhanced weather protection

At Point North Profabrics, one of the most popular specialist options is the YKK AquaGuard range of waterproof zips, often used on waterproof jackets, bike bags and technical outdoor equipment.

Understanding Zip Sizes

Zip sizes are typically indicated by a number, which refers to the approximate width of the zip chain when the zip is closed. As the number increases, so does the size and strength of the zip.

Zips are available in a range of sizes, from lightweight options used in clothing and pockets through to heavy-duty versions designed for demanding outdoor and marine environments.

For many clothing and bag-making projects, medium-sized zips such as #5 and #6 provide an excellent balance of strength, flexibility and ease of use. These are commonly found on fleeces, lightweight jackets, handbags and general-purpose luggage.

At the heavier end of the scale, #10 zips are often chosen for applications where durability is critical. You'll frequently see them used on boat covers, caravan awnings, tents and other outdoor equipment that needs to withstand regular use and exposure to the elements.

When selecting a zip, bigger isn't always better. A heavy-duty zip fitted to a lightweight fabric can feel bulky and may place unnecessary strain on the surrounding material. The best approach is to choose a zip that matches both the weight of the fabric and the demands of the finished project.

At Point North Profabrics, we can advise on the most suitable zip size for your application, whether you're making a lightweight garment, a custom bag or a heavy-duty outdoor cover.

Can You Repair a Zip?

Many customers contact Point North Profabrics looking to replace broken sliders or repair existing zips.

Unfortunately, zip compatibility can be surprisingly complex. Sliders from one manufacturer may not work correctly with another, even when the zips appear similar.

If you're attempting a repair, photographs and markings on the existing zip can often help identify the correct replacement components.

Need Help Choosing a Zip?

With so many options available, selecting the right zip isn't always straightforward.

Whether you're looking for waterproof zips, marine-grade zips, replacement zip components or a zip by the metre, the team at Point North Profabrics can help.

We regularly advise customers working on everything from outdoor clothing and bike bags to boat covers, awnings and technical sewing projects. If you're unsure which zip is best for your application, simply get in touch and we'll help you find the most suitable option from our extensive range.