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The Locarno Film Festival x ZigZagZurich Collection: One Pardo, Three Artistic Visions

The Locarno Film Festival x ZigZagZurich Collection: One Pardo, Three Artistic Visions

August 28, 2026

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ZigZagZurich featured in the magazine Das Einfamilienhaus

ZigZagZurich featured in the magazine Das Einfamilienhaus

August 24, 2026

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Cushion Insert Size Guide for a Fuller Look

Cushion Insert Size Guide: How to Get a Full, Tailored Look

Cushion Insert Size Guide: How to Get a Full, Tailored Look

Cushion Insert Size Guide: How to Get a Full, Tailored Look

Products and materials selected for cushion insert size guide

Products Used

Products and materials selected for cushion insert size guide

The right cushion insert does more than fill empty space. It supports the corners, determines how smoothly the fabric sits, shapes the cushion’s profile and affects how much pressure is placed on the zip and seams.

Two covers with the same labelled dimensions may need different inserts. A tailored linen cover, for example, behaves very differently from a stretchy knitted cover or one designed to drape softly.

This guide begins with the cover’s actual fillable space, then considers the filling material, fabric weight and the look you want to achieve. There is no universal rule that you should always choose a larger insert. The product maker’s recommendation should come first, because it is based on the specific pattern, seams, zip, textile and intended shape of the cushion.

A label such as 45 × 45 cm usually describes the cover’s nominal format. It does not guarantee that an empty cover will measure exactly 45 cm from every side, or that the finished cushion will remain a perfectly flat 45 × 45 cm square.

Seam allowances sit inside the cover, while tapered corners, piping and flanges may extend beyond the area that holds the filling. Once the insert is added, its volume pulls the front and back of the cover inward, creating a three-dimensional shape.

The fabric itself also changes the result. Woven linen may retain a more structured, architectural outline. Velvet can create a full, softly rounded appearance. A knitted wool blend may relax and stretch around the insert.

When choosing a cushion insert, it helps to distinguish between four measurements:

  • Nominal cover size: the size stated on the product page or label.
  • Empty cover size: the measurement of the cover across its fillable area before filling.
  • Insert size: the manufacturer’s stated dimensions of the insert before it is placed inside the cover.
  • Finished cushion size: the final three-dimensional shape after filling and arranging.

A ZigZagZurich cushion illustrates why these measurements can differ. The Geometric Blue/Pink cashmere and merino wool cushion cover is sold as a 50 × 50 cm cover, but the finished knit measures approximately 48–49 cm and stretches slightly into shape. The cover and filling are sold separately.

The 50 × 50 cm nominal size is still the correct reference when choosing the insert. The slightly smaller empty measurement is simply a result of the knitted construction, and the cover is designed to take its final shape once filled.

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Cushion Insert Size Guide: How to Get a Full, Tailored Look

Relaxed, standard and extra-full looks

Measure the cover without an insert, on a flat surface, with the zip closed and the fabric relaxed. Do not stretch a knitted or elastic textile to reach its advertised size. Smooth major folds without pulling the seams out of shape.

Lay the cover face up and align it naturally.

Measure horizontally from the inner edge of one side seam to the inner edge of the opposite seam.

Measure vertically from the inner edge of the top seam to the inner edge of the bottom seam.

Exclude decorative flanges, tassels and piping that sit beyond the fill cavity.

For a rectangle, record width and height in the same orientation as the product description.

For a gusseted cover, also record the side depth and ask for a compatible three-dimensional insert.

Compare your measurements with the product label before ordering.

Measure twice if the cover is soft or irregular. If the two sides differ slightly because of handmade construction or textile relaxation, do not force them square. Use the nominal product size and the maker’s recommendation, and contact the seller when the difference is large enough to affect fit.

A common rule suggests using an insert one size step larger than a small square cover. That can work, but it is a starting heuristic rather than a law. Insert brands vary in loft and true finished volume. A soft feather insert compresses differently from a resilient synthetic cluster or a cut foam pad. A 50 × 50 cm insert from one supplier may not fill like another with the same label.

The Parapeople artist cushion provides a precise product example: the cover is 45 × 45 cm, filling is not included, and ZigZagZurich recommends a 50 × 50 cm insert. Use that recommendation for this design. Do not automatically transfer the five-centimetre difference to a rectangular, knitted, piped or very large cover whose maker specifies something else.

Feather-based inserts are compressible and easy to shape. They can create a generous face while still passing through a zip opening and can be plumped or given a central crease. Their appearance changes with fill weight and feather-to-down ratio, so dimensions alone do not describe support. They require regular redistribution and may not suit every preference, allergy requirement or sourcing standard.

Selected products for this guide

Round, bolster and unusual formats

Polyester or recycled-fibre inserts range from lightly filled to firm, springy clusters. They can hold a rounded profile with less daily plumping, but some are more resistant to compression than feather. A highly resilient insert that is too large can push hard against seams even if a soft insert of the same nominal size would fit.

Foam inserts depend on exact width, height and thickness. They are appropriate when a seat, bench or sharply tailored cushion needs controlled support, but the decorative “size up” rule should not be applied blindly. A foam form that is too large may not pass through the opening and can deform the cover; one that is too small leaves loose faces and edges.

Kapok, wool and other loose fibre fills have distinct resilience, weight and maintenance needs. Assess the complete insert rather than assuming performance from the fibre name. A maker’s fill weight, casing, compartment construction and care instructions determine how the insert behaves over time.

For a conventional woven square cover, begin with its labelled size and check whether the maker recommends a matching or larger insert. If no guidance exists, decide whether you prefer relaxed or full, then compare inserts by both dimensions and fill weight. Buy one test insert before ordering a full sofa set when returns or local availability make that practical.

A matching 45 × 45 cm insert may suit a casual, softer square. A 50 × 50 cm compressible insert can create a fuller 45 × 45 cm cushion when the cover construction permits it, as ZigZagZurich specifies for Parapeople. Neither outcome is universally correct. If corners remain empty with a full centre, the issue may be the insert’s rounded pattern rather than its overall size.

Rectangles are less forgiving because width and height perform different jobs. An insert that is too long can bow the centre or force the end seams; one that is too tall can turn a refined lumbar shape into a hard cylinder. Match the aspect ratio first. Do not put a folded square insert inside a rectangular cover and expect even support.

If sizing up is recommended, confirm which dimension changes. Some makers increase both axes; others specify an insert made expressly for the stated cover. Measure the zip opening as well as the cavity and choose a form that can compress through it without forcing the slider.

Round, bolster and unusual formats
ZigZagZurich

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A design perspective on cushion insert size guide

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FROM THIS ARTIST / ZZ RECOMMENDATIONS

Cushion Insert Size Guide: How to Get a Full, Tailored Look Cushion Insert Size Guide: How to Get a Full, Tailored Look

The best insert fits the cover and the intended character

Close the zip slowly. If it begins to resist, stop and reassess the fit rather than forcing it.

Once the insert is inside, plump the cushion from the sides and work the filling evenly into every corner. This helps the cover take its intended shape and prevents unnecessary pressure on the seams and zip.

Never pull the cover by the zip or use the zip slider to compress the insert. A soft, compressible insert may fit through an opening that is slightly smaller than the cover, but a rigid foam insert may require a different construction or professional assistance.

  • Before choosing an insert, consider:
  • Is the product a cover only, an insert only or a complete cushion?
  • What nominal cover size is stated?
  • Does the seller recommend a particular insert size or filling?
  • What does the empty cover measure from seam to seam without stretching?
  • Is the cover woven, knitted, piled, piped, flanged or gusseted?
  • Do you want a relaxed, standard-full or extra-full appearance?
  • How soft, compressible or densely filled is the insert?
  • Can it pass through the zip without placing stress on the cover?
  • Do allergies, sourcing, care requirements or firmness preferences affect your choice of filling?
  • Can the insert be returned if its actual loft is different from expected?

You can browse the ZigZagZurich pillows and cushions collection by material and design, then check the details of the individual cushion cover before selecting the filling. This is particularly important when buying a cover on its own, as insert recommendations and inclusion vary between products.

Choosing the right insert involves more than comparing numbers. Measure the cover’s actual fillable space, check the stated product size, and consider the fabric’s stretch, weight and construction. Then compare fillings based on their loft, softness and compressibility.

A slightly larger insert can create a tailored, well-filled square. The same approach may distort a knitted cover, rectangular cushion or structured foam design.

Whenever a maker provides a recommendation, use it as your starting point. ZigZagZurich’s own products show why. One 45 × 45 cm printed cover recommends a 50 × 50 cm insert, while a knitted 50 × 50 cm cover is designed to measure slightly smaller before stretching into shape.

The best fit comes from understanding the complete construction of the cushion, not from applying a universal rule such as “always size up.”

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