How to Wash and Store Merino Sweaters Without Stretching

Quick answer

Wash merino sweaters inside out in cold water on a gentle cycle or by hand, then gently press out water without wringing. Dry them flat on a towel away from heat and sunlight, reshaping to their original dimensions. Store folded, not hung, and use breathable bags with cedar or lavender for summer. This prevents stretching, pilling, and shape loss.

Why merino sweaters stretch and how to prevent it

Merino wool fibers are elastic and can stretch when wet because water relaxes the fiber structure. The biggest culprits are hanging a wet sweater, wringing it out, or using hot water that causes felting and distortion. To prevent stretching, always support the full weight of the sweater when moving it, and never hang it wet. If you use a washing machine, choose a gentle cycle with low spin speed and a mesh laundry bag. For hand washing, avoid twisting or pulling. After washing, gently squeeze water out by pressing the sweater between two towels, then reshape it on a dry towel to dry flat. This method keeps the fibers relaxed and helps the sweater return to its original size.

How to hand wash a merino sweater step by step

Fill a clean sink or basin with cool water (below 30°C/85°F) and add a gentle wool detergent. Submerge the sweater and let it soak for 5–10 minutes. Gently press the water through the fibers—do not rub or scrub. Drain the soapy water and refill with clean cool water to rinse. Repeat until no suds remain. To remove excess water, lay the sweater on a clean towel, roll the towel up, and press down. Never wring or twist. Then lay the sweater flat on a dry towel, reshape the sleeves, body, and neckline, and let it air dry away from direct heat or sun. This process minimizes agitation and keeps the sweater's shape.

Machine washing merino sweaters safely

If your sweater's care label allows machine washing, turn it inside out and place it in a mesh laundry bag. Use a front-loading machine on a wool or gentle cycle with cold water and low spin. Add a small amount of wool-safe detergent—never use bleach or fabric softener. After the cycle, immediately remove the sweater and lay it flat to dry as described above. Avoid washing merino with heavy items like jeans or towels, as the friction can cause pilling. If your machine has a high spin speed, reduce it or skip the spin altogether to prevent stretching.

Drying merino sweaters flat without stretching

Drying flat is the single most important step to prevent stretching. Lay the sweater on a clean, dry towel on a flat surface. Gently reshape it to its original measurements—don't pull or tug. If the sweater is heavy with water, change the towel underneath once it becomes damp. Keep it away from radiators, direct sunlight, and dryers, which can shrink or damage the fibers. It may take 24–48 hours to dry completely. For faster drying, you can use a fan on low, but never hang the sweater. Once dry, store it folded.

How to fix pilling on merino sweaters

Pilling is normal for merino, especially in high-friction areas like underarms and sides. To remove pills, lay the sweater flat and use a fabric shaver or a fine-tooth comb to gently lift them off. Work in one direction with light pressure—don't dig into the fabric. For small pills, a piece of Velcro or a pumice stone can work. After de-pilling, wash the sweater as usual to smooth the fibers. To reduce future pilling, wash less often, use a mesh bag, and avoid wearing rough backpacks or belts that rub.

Merino sweater storage tips for summer

Before storing for summer, make sure the sweater is clean—even invisible stains can attract moths. Fold sweaters neatly and stack them in a breathable cotton or canvas bag or a suitcase. Avoid plastic bins or vacuum bags, which trap moisture and can cause mildew. Add cedar blocks, lavender sachets, or mothballs (if you don't mind the smell) to deter insects. Store in a cool, dry place away from direct light. Never hang merino sweaters for long-term storage, as the weight can stretch shoulders and necklines. If you have a merino wool hoodie, fold it the same way, and keep the hood flat to avoid creases.

Step-by-step merino sweater care

1. 1. Read the care label first: Check if your sweater is hand-wash or machine-wash only. Ignoring this can cause irreversible shrinkage or stretching. When in doubt, hand wash.
2. 2. Pre-treat stains gently: Dab a small amount of wool-safe detergent onto stains and let sit for 5 minutes. Don't rub, as it can distort fibers. Rubbing causes pilling and stretching.
3. 3. Wash in cold water: Use a gentle cycle or hand wash with cool water and wool detergent. Never use hot water or regular detergent. Hot water felts wool and locks in stains.
4. 4. Remove excess water without wringing: Press the sweater between two towels to absorb water. Never twist or wring, which stretches the fibers. Wringing is the fastest way to ruin a sweater.
5. 5. Dry flat and reshape: Lay the sweater on a dry towel, reshape to original dimensions, and air dry away from heat. Flip occasionally for even drying. Hanging wet merino will stretch it out of shape.
6. 6. De-pill as needed: Use a fabric shaver or comb to gently remove pills after the sweater is completely dry. Work in one direction. De-pilling restores a smooth look without damaging fibers.
7. 7. Store folded, not hung: Fold sweaters and store in a breathable bag with cedar or lavender. Keep in a cool, dry place for summer. Hanging causes shoulder bumps and stretching.

Merino care essentials from our store

• Men's Merino 260 Oasis Long Sleeve Half Zip Thermal Top: Men's Merino 260 Oasis Long Sleeve Half Zip Thermal Top is made with 260gsm merino and is machine washable on a gentle cycle. This midweight top can be washed like your sweaters, but always follow the same cold, gentle care to prevent stretching.
• Men's Merino Lifestyle Light Crew Socks: Men's Merino Lifestyle Light Crew Socks are a lightweight merino blend for everyday comfort. These socks can be washed with your sweaters, but use a mesh bag to keep them from snagging.
• Women's Merino Blend 125 Cool-Lite™ Sphere Long Sleeve T-Shirt: Women's Merino Blend 125 Cool-LiteTM Sphere Long Sleeve T-Shirt is lightweight and versatile for active pursuits. Its lighter fabric dries faster, but still requires flat drying to maintain shape.