If there is a yarn at BONIFAKTUR that can do almost everything, it is Knitting for Olive Merino. And if there is a yarn that can do the same – just a bit faster – it is the Heavy Merino. Both come from the same Danish brand, both share a carefully coordinated color palette (over 90 for Merino, over 60 for Heavy Merino). Both are OEKO-TEX® Standard 100 certified, both are made from Non-Superwash Merino Wool. And yet they are not the same – and which one you choose determines the outcome of your project.
This article explains what distinguishes the two yarns, which projects each is ideal for, how to make the right choice, and what happens if you substitute one for the other.
What is Knitting for Olive Merino?
KFO Merino is a Fingering-Weight yarn made of 100% Merino Wool. With a meterage of 250 meters per 50g, it is one of the longest yarns of its weight – you get a lot of yarn for your money. The recommended needle size is 2.5–3.5mm, the typical Gauge in stockinette stitch is 28 stitches x 38 rows per 10cm.
KFO Merino is the yarn that made Knitting for Olive famous. Since its founding in 2014 by Mette Wendelboe, the Copenhagen brand has developed a color palette that clearly stands out from other industrial yarn colors: no pure primary colors, no neon, no bright tones just for the sake of being bright. Instead: Dusty Rose, Pale Eucalyptus, Amber, Fog Grey – colors that work together, that you really want to wear, and that look the same in the finished piece as on the ball.
Technically, KFO Merino has a medium twist – soft enough for wearables, structured enough for clear patterns. It should be hand washed, retains its shape after drying, and shows a slight Bloom after the first wash: the fibers loosen slightly, making the yarn even softer.
What is Knitting for Olive Heavy Merino?
KFO Heavy Merino is – simply put – the bigger sibling. Also 100% Merino Wool, also OEKO-TEX® certified, also in (almost) the same color palette. But with a meterage of about 125m/50g and a needle size of 4–5mm, it is roughly twice as thick.
The weight of Heavy Merino lies between DK and light Worsted. The Gauge is about 18 stitches per 10cm. Projects in Heavy Merino grow significantly faster – a simple hat is finished in 2–3 hours, an uncomplicated sweater in one to two weeks.
Heavy Merino has similar care properties to thin Merino: hand washable, shape-retentive after washing, with the same typical Bloom. The difference: the stitches are larger and more visible. Textured Stitch patterns like cables, ribs, and reliefs stand out particularly well.
The direct comparison
| Feature | KFO Merino | KFO Heavy Merino |
|---|---|---|
| Weight | Fingering (250m/50g) | DK/light Worsted (125m/50g) |
| Needle Size | 2.5–3.5mm | 4–5mm |
| Gauge | 28 M/10cm | 18 M/10cm |
| Fiber content | 100% Merino | 100% Merino |
| Certification | OEKO-TEX® Standard 100 | OEKO-TEX® Standard 100 |
| Color palette | 90+ Colors | Same palette (slightly smaller) |
| Care | Yes, Hand Wash | Yes, Hand Wash |
| Project speed | Slower, finer | Faster, bulkier |
What projects are suitable for KFO Merino?
Delicate Shawls and Stoles: Fingering shows lace patterns, color gradients, and fading effects with a fineness that DK never achieves. A large triangular shawl made from KFO Merino can be made from 150–200g, weighs almost nothing, and is still warm.
Lightweight Sweaters and Cardigans: For sweaters that should feel like a fine ready-to-wear garment. The higher stitch count per row allows for more precise shaping – shoulder lines, armholes, and waists come out finer than with DK.
Colorwork and Stranded Colorwork: The fine stitch density allows complex motifs with many stitches per motif repeat. If you want to knit traditional Nordic patterns with rich detail, KFO Merino is the right choice – it lies flat, keeps the second color clear, and the finished piece shows the patterns like embroidery.
Baby clothing for special occasions: For christening outfits, fine rompers, and first wardrobe pieces that are handled more gently.
What projects are suitable for KFO Heavy Merino?
Everyday sweaters for adults: This is the core strength of Heavy Merino. A Top-Down Raglan in Heavy Merino takes about half the hours as the same sweater in KFO Merino – and looks just as beautiful. If you want to knit a sweater without working on the project for months, choose Heavy Merino.
Hats and beanies: Quick, simple, satisfying. A straightforward hat in Heavy Merino is done in an evening.
Children’s and baby clothing: For everyday pieces that are washed regularly. Heavy Merino is soft enough for baby skin, easy-care enough for family life, and quick enough so the child doesn’t outgrow the jacket before it’s finished.
Beginner projects: If you’re knitting for the first time or returning after a long break, you benefit from the visibility of the stitches. On 4–5mm needles, mistakes are easier to spot and correct.
Textured Stitch like cables and ribs: The larger stitches make cables appear more three-dimensional. A cable-pattern scarf in Heavy Merino is both quick to finish and visually impressive.
Scarves and accessories: If you’re knitting a Christmas gift and have five days: Heavy Merino.
What happens if I replace one with the other?
Short answer: You need to recalculate the pattern. KFO Merino and Heavy Merino are not interchangeable without adjustment.
Converting a pattern for KFO Merino (Fingering, Gauge 28 sts/10cm) to Heavy Merino (Gauge 18 sts/10cm) means: fewer stitches for the same width. You must adjust the stitch count or switch to a pattern specifying DK/Light Worsted.
The reverse path – knitting a Heavy Merino pattern with KFO Merino – means more stitches, finer work, longer knitting time, but a finer result.
There are projects that work well in both weights. Many beginner patterns give a range: “DK to light Worsted.” Heavy Merino fits perfectly there. But always check the Gauge of the pattern and knit your own swatch before you start.
Colors: Are there differences?
The color palettes of KFO Merino and Heavy Merino are deliberately coordinated – but not identical. Some colors exist only in Fingering, others only in Heavy Merino. If you need a specific color in both weights (for example, for a sweater combining Merino detail work at the hem with Heavy Merino on the body), check beforehand if that color is available in both lines.
For Fading Projects or multicolored shawls where both yarns are used together: The color matching is excellent.
KFO Merino + Soft Silk Mohair: The Combination
No comparison between these yarns would be complete without mentioning KFO Soft Silk Mohair. The Lace yarn made of 70% Kid Mohair and 30% Silk is almost always knitted together with KFO Merino or Heavy Merino – one strand of each, held together on the needle.
With KFO Merino: Classic, elegant combination. The finished piece is light, warm, with a subtle Halo. With Heavy Merino: Even fluffier, even warmer. For winter sweaters where coziness is a priority.
Our Conclusion
When you have a tough choice: First consider how much time you have and what kind of project you plan.
Choose KFO Merino if:
- You want a fine shawl or stole
- You knit colorwork with many motif details
- You knit baby clothes for special occasions
- You take your time and appreciate fine details
Choose KFO Heavy Merino if:
- You want to finish an everyday sweater in a realistic time
- You knit a hat as a weekend project
- You are a beginner and want to see the stitches clearly
- You knit cables or Textured Stitch
- You sew baby clothes for everyday use
Both are reliable, beautiful, and of a quality that immediately shows in the finished piece. It’s not about which is better – but about which suits your project better.
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