Knitting in summer – it’s possible. And it’s fun when you have the right yarn in your hands. Heavy Merino feels warm in July, almost too warm. But a light Cotton-Linen yarn, an airy Silk yarn, or a fine Cotton-Merino blend yarn feels completely different: cool, smooth, pleasant. And the finished piece is a summer garment you actually wear – not another winter sweater for the drawer.

This article explains what makes a good summer yarn, which fibers are suitable for warm days, which specific yarns we recommend – and which projects are especially fun in summer.

What makes a good summer yarn?

Four properties define a good summer yarn:

Cooling effect

The most important criterion. Plant Fibers – Cotton, Linen – actively cool: they hardly insulate, conduct body heat well, and feel fresh on the skin. Linen cools more than Cotton – it conducts heat especially well and has an almost cool-moist hand feel in warmth.

Silk is also an excellent summer fiber: it absorbs moisture and releases it slowly, creating a pleasant body feeling. Silk doesn’t actively cool like Linen, but feels noticeably more comfortable on the skin than wool.

Pure Merino Wool is an insulator – but fine Merino Wool combined with Cotton (like KFO Cotton Merino) results in a yarn that feels significantly lighter and cooler than pure Merino.

Airiness and weight

Lightweight yarns in Fingering or Sport Weight create open, breathable pieces. The finer the yarn and the looser the stitch definition, the more air circulates through the fabric.

Plant fiber yarns knitted on slightly larger needles than recommended: This creates a more open, airy fabric that is especially pleasant in summer.

Ease of care

Summer clothes are often washed. Sand, sunscreen, sweat – all end up in the laundry. Machine-washable yarns are especially practical in summer.

Plant Fibers (Cotton, Linen) are generally more durable and easier to care for than wool fibers. Cotton is often even washable at 40°C. Linen gets softer with every wash.

Knitting fun in summer

It sounds subjective – but it’s real. Thick, woolly yarn on your fingers in July is simply less fun than a smooth, thin cotton or silk yarn. When knitting itself is pleasant, you knit more.

The fibers at a glance: What is suitable for summer

Cotton

The classic summer fiber. Cool, hypoallergenic, easy to care for. Cotton lies smoothly on the needle – no spring-back like with wool. That means: stitches sit exactly as you knit them. This is an adjustment for everyone who mainly knits with Merino.

What you should consider when knitting with Cotton: the lack of elasticity makes undoing stitches a bit more difficult. The stitches are less forgiving. However, the result is very clear and neat – Cotton stitches sit precisely.

Organic Cotton (as in KFO Cotton Merino) is grown under ecological standards and is suitable for OEKO-TEX certifications.

Linen

The coolest among summer yarns. Linen fibers conduct heat excellently – this is immediately noticeable in hot weather. Linen is also very firm and gives pieces good shape retention without wool elasticity.

The character of Linen is natural and honest. The yarn is not soft in the Merino sense – it feels rather firm and natural. But: with every wash, Linen gets softer. A Linen piece improves with age.

Especially well suited for bags, summer tops, scarves – anything that needs shape retention.

Silk

Silk is naturally temperature-regulating: it absorbs body heat and releases it slowly, creating a pleasant cooling effect. At the same time, Silk has a characteristic drape and sheen that plant fibers lack.

Bourette Silk (as in KFO Pure Silk) is duller and more textured than filament silk but has the same pleasant character. For summer shawls and scarves, a silk yarn is an excellent choice.

Cotton-Merino blend yarns

The compromise for everyone who loves wool but wants to knit lighter in summer. Cotton-Merino blend yarns like KFO Cotton Merino combine the cooling effect of Cotton with the elasticity and beautiful stitch definition of Merino. The result is more pleasant to knit than pure Cotton yarn and noticeably cooler to wear than pure Merino.

The best summer yarns at BONIFAKTUR

KFO Cotton Merino (Fingering, Organic Cotton + Merino, OEKO-TEX® certified)

The all-rounder for summer. Knitting for Olive Cotton Merino is OEKO-TEX® Standard 100 certified, made from organically grown Cotton and Merino Wool, and machine washable on the wool cycle. It is lighter than pure Merino and cooler to wear, with the shape retention and elasticity that Merino Wool provides.

The yarn feels pleasant on the needle – not slippery like pure cotton, not grippy like pure Merino. The color palette follows the typical KFO aesthetic: curated, restrained, no compromises.

Ideal For: summer clothing, baby projects, lightweight sweaters and cardigans for warm seasons, spring and autumn pieces.

Needle Size: approx. 3–4mm

KFO Pure Silk (Fingering, 100% Bourette Silk)

Silk is naturally cooling. KFO Pure Silk made of 100% Bourette Silk is the purest summer yarn in the KFO range: no wool content, only silk. Matte-shimmering, with fine texture, excellent Drape.

For summer shawls and stolas, KFO Pure Silk is incomparable: The finished shawl drapes fluidly, feels pleasant at body temperature, and has a subtle sheen that is neither exaggerated nor industrial. For festive summer occasions or as an elegant everyday shawl.

Care Instructions: Silk requires Hand Wash at max. 30°C, no direct sunlight when drying.

Needle Size: approx. 2.5–3mm

BC Garn Lino (100% Linen)

The ultimate summer yarn when coolness is the main goal. Linen cools more than any other textile fiber – and BC Garn Lino made of pure Linen becomes softer and more pleasant with every wash over time.

BC Garn Lino has a natural, honest character: firm, clear, with a slight texture that shows it is made from Plant Fibers. With each wash, the linen fibers relax and the yarn becomes softer.

Especially good for summer tops and blouses, bags and pouches, lightweight shawls and scarves, and baby summer clothing. Needle Size: approx. 2.5–3.5mm

Pro Tip: If you knit 100% Linen or Cotton, be sure to make the Gauge large enough and hang it to dry weighted at the bottom with a few clothespins. This simulates the weight of the finished garment and prevents surprises in length.

Scheepjes Stone Washed (Sport Weight, 78% Cotton, 22% Acrylic)

For bright summer colors and a wide range of projects – both Knitting and Crochet. Stone Washed by Scheepjes is somewhat duller and more textured than regular Cotton yarns due to the stonewashed finish. The color palette is colorful and extensive.

Machine washable, durable, and especially easy-care in this combination of Cotton and Acrylic. For everyone who wants bright colors in summer.

Manos del Uruguay Fino (Fingering, 70% Merino, 30% Silk)

Merino meets Silk – the result is a yarn with natural sheen and light Drape, comfortable even in summer. Hand-Dyed in Uruguay, Fair Trade certified. The shades have a depth and complexity that industrial yarns cannot achieve.

Fino is in the transitional range: Merino and silk together are lighter than pure Merino but heavier than pure cotton or linen yarn. It is an excellent choice for summer shawls and festive stolas.

Projects for Summer

Summer Tops and Lightweight Sweaters

The classic summer knitting project. In KFO Cotton Merino or BC Garn Lino on 3–3.5mm needles, a light, breathable fabric is created. Top-Down raglan or yoke construction without seams is ideal for summer tops.

A practical tip: knit on needles slightly larger than recommended. This opens up the stitch definition and makes the fabric airier – perfect for hot days.

Shawls for Warm Days

A lightweight cotton or silk shawl is a versatile summer companion: cool enough for warm evenings, elegant enough for special occasions. For fading shawls with KFO Cotton Merino or for festive stolas made from KFO Pure Silk or Manos Fino.

Bags and Pouches

Linen or cotton are ideal for shopping and beach bags – shape-retentive, sturdy, and easy to wash. BC Garn Lino in a simple stitch pattern creates a robust bag that only gets better with time.

Sandal Socks

Short socks made from cotton blend yarn in Fingering for everyone who wants to wear sandals with socks in summer. Quick to knit, practical, and in the right colors a real summer statement.

Baby Clothes for Summer

Summer baby clothes made from KFO Cotton Merino are soft, cool, OEKO-TEX® certified – and machine washable. Baby cardigans, blankets, and socks in light colors: summer baby clothes knitted from Cotton Merino make a perfect gift for expectant parents.

A Tip for Summer

Use the summer for projects you wouldn’t knit in winter – because the finished piece would be too warm to wear and knitting itself would be too hot. A lightweight cotton top is pleasant to knit in August.

Or the other way around: Knit in summer for winter. Thick, warm yarns can be uncomfortable to knit with in summer – but the motivation to start a wool sweater in October is high when you know it should be finished by November.

Read More: