Reiff · Merino Wool Arm Warmers
Women's Fingerless Merino Wool Arm Warmers
GOTS-certified merino wool fleece arm warmers with thumbholes. German-made layering piece designed for sensitive skin and active outdoor work in cool climates.
Brand & Heritage
Reiff has manufactured wool apparel in Germany since the 1970s, specializing in sleep sacks, base layers, and layering pieces that prioritize fiber quality and honest construction. The brand holds GOTS certification and sources Patagonian merino wool processed and knit in Germany. Reiff's attention to micron count and finishing means their merino pieces are reliably soft and designed for next-to-skin wear.
What These Are For
These arm warmers are a standalone layering piece for cool-weather work and activity. Wear them over a long-sleeve shirt or under a jacket for added warmth without bulk. The fingerless design with thumbholes keeps hands mobile while protecting forearms and upper arms from wind and cold. They're ideal for outdoor work (gardening, hiking, building), office workers in chilly spaces, and anyone needing portable warmth that doesn't restrict hand movement.
Temperature range: Best for 40–60°F (4–15°C) as a standalone layer, or 30–50°F (−1–10°C) when worn under a jacket. Merino wool's temperature-regulating properties mean these work in fluctuating conditions without overheating.
Materials & Construction
100% organic merino wool fleece (mid-weight knit with brushed interior pile). GOTS-certified and kbT (kontrolliert biologische Tierhaltung) certified — meaning the wool comes from certified organic livestock farming with documented animal welfare standards. Sourced from Patagonian merino sheep, processed and manufactured in Germany. This particular knit is brushed to create a soft pile similar to synthetic fleece, but with wool's inherent properties: breathability, temperature regulation, and natural odor resistance.
Fiber
100% organic merino wool, mid-weight fleece brushed to soft pile
Certifications
GOTS (Global Organic Textile Standard), kbT (organic livestock farming)
Construction
Knitted merino wool with brushed fleece pile interior
Manufacture
Made in Germany
Key Features
Temperature Regulating
Merino wool naturally regulates body temperature, keeping you warm without overheating. The brushed fleece layer adds insulation while remaining breathable.
Odor Resistant
Merino's natural antibacterial properties resist odor development. Wear longer between washes without smell accumulation—ideal for active use.
Fingerless Mobility
Thumbhole design keeps forearms and upper arms warm while leaving fingers free for work, typing, phone use, or fine tasks.
Sensitive Skin Suitable
Fine merino at approximately 17–20 microns is soft enough for most adults with sensitive skin. Some individuals still react to wool—see Honest Assessment below.
Sizing & Fit
These arm warmers are designed as one-size-fits-most for women. Length is approximately 15 inches (38–39 cm) from wrist to shoulder, and the cuff width is approximately 4 inches (10 cm).
Fit Note
These are fitted but stretchy. They are designed to sit snug on the forearm and upper arm without restricting circulation. If you have very slender arms, they may slide down slightly during active use; if you have larger arms, they provide compression layering.
Honest Assessment
Best For
Adults (especially women) with sensitive skin seeking portable arm warmth for outdoor work, gardening, hiking, or office use. Ideal for people who need hand mobility but want forearm and upper-arm protection. Merino properties (odor resistance, temperature regulation) make these good for multi-day outdoor trips where frequent washing isn't possible.
Trade-Offs to Consider
A small percentage of people remain sensitive to wool even at fine micron counts. If you've reacted to wool before, test with a wool/silk blend first. These are not waterproof—they will absorb water in heavy rain (though the brushed fleece dries faster than dense knits). The fit is form-fitting, so if you prefer loose layering, these may feel snug.
Investment Case
These are a workhorse piece. The fine merino doesn't pill easily, odor resistance means less frequent washing (extending garment life), and the neutral colorway works across multiple wardrobes. With proper care, merino arm warmers easily last 5+ years of regular use and often get passed along. Compared to synthetic arm sleeves that degrade and pill, these represent real longevity.
Care Instructions
Hand wash or wool cycle Cold water Wool wash only Lay flat to dry
Hand wash in cold water with wool-specific detergent (Eucalan, Sonett, or similar), or use the wool/delicate cycle on your washing machine with cold water only. Do not use regular laundry detergent—it strips wool's natural oils and can cause matting. Press water out gently; never wring or twist. Lay flat on a towel to dry away from direct heat or sunlight. Air between wears—merino naturally resists odor, so you rarely need to wash after single use. Most spot-cleaning of visible dirt is sufficient between full washes.
Why cold water matters: Hot water causes merino fibers to swell and lock together (felting), permanently shrinking the piece. Cold water + gentle agitation preserves the fiber structure.
Questions & Answers
Will these arm warmers make my arms itch?
Fine merino wool at 17–20 microns is meaningfully softer than coarse wool and comfortable against skin for most adults. That said, approximately 1–2% of people remain sensitive to wool at any micron count due to the protein structure, not diameter alone. If you've had sensitivity to wool in the past, consider starting with a wool/silk blend (like Reiff's merino/silk pieces) as the first test—the silk significantly softens the hand feel and reduces reactivity.
Are these waterproof or water-resistant?
These are not waterproof. Merino wool will absorb water, but it retains warmth even when wet—a key advantage over synthetic. For sustained rain, wear these under a waterproof jacket rather than as a standalone layer. Light drizzle or snow on them will shed naturally as the outer fibers repel moisture briefly, but don't rely on that in heavy conditions.
How often should I wash these?
Merino's odor-resistant properties mean you can wear these multiple times before washing. Most people wash after 5–10 wears or whenever visible dirt accumulates. Between wears, air them in sunlight or fresh air—this naturally removes odors and refreshes the fibers. Frequent washing is unnecessary and will shorten garment lifespan.
Can I machine wash these?
Yes, using the wool or delicate cycle with cold water only, plus wool-specific detergent. Do not use regular laundry detergent or hot water. Avoid the spin cycle if possible (spin can cause creasing)—if your machine has a low-spin option, use that. Many people prefer hand washing to extend durability, but machine washing on wool cycle is acceptable.
Will these pill?
Fine merino rarely pills because the fibers are smooth and slide against each other rather than catching. The brushed fleece construction is less prone to pilling than plain knits. If minor pilling occurs (usually only in areas of heavy friction like the inner wrist), gently remove pills with a pill comb or fine brush—do not pull or tear.
What does GOTS certification mean?
GOTS (Global Organic Textile Standard) is the leading worldwide standard for organic textiles. It covers the entire supply chain: organic fiber farming (no synthetic pesticides or fertilizers), fiber processing, dyeing, finishing, and manufacturing. GOTS-certified means independent verification of standards at every step, not just the fiber source. kbT (kontrolliert biologische Tierhaltung) additionally certifies that the livestock itself was raised on certified organic farms with strict animal welfare standards.
How do I layer these with other pieces?
Wear these over a long-sleeve base layer or cotton shirt for comfortable next-to-skin layering. Or wear over the outside of a long-sleeve shirt and under a jacket for hidden warmth without adding visible bulk. The fingerless thumbhole design makes them easy to adjust—push them up to your elbows if you need hand warmth, or pull them to your wrists if you overheat. They work equally well as a standalone layer in mild cold or as a mid-layer in harsh conditions.
