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Material & Craft: A fine Lamb's Wool blend with cashmere and silk, carefully knitted in Osaka, Japan.
Texture: Soft, lightweight feel with a subtle sheen and reliable warmth.
Silhouette: Classic fit

Crafted in Osaka, Japan Since 1966:
Every garment is knitted, inspected, and hand-finished by our artisans under one roof. This is the essence of Japanese Monozukuri (craftsmanship)—where uncompromising quality meets timeless design.
Our knitwear features a clean, tailored silhouette designed to prevent bunching or sagging. As a result, our fits run slightly trimmer than traditional American brands.
US Size Comparison
- US S (Polo RL / J.Crew) ➔ Mooncastle M
- US M (Polo RL / J.Crew) ➔ Mooncastle L (Tailored) or XL (Relaxed)
- US L (Polo RL / J.Crew) ➔ Mooncastle XXL
Quick Tip: If you are between sizes or prefer a more relaxed fit, we highly recommend sizing up one full size.
Ordered the wrong size? Return with a prepaid UPS label, and we’ll send the replacement from our US warehouse.
How to Wash
To preserve the soft texture, natural luster, and shape of this delicate knit, professional dry cleaning is highly recommended.
Dry Clean (Recommended): Please consult a trusted professional cleaner to maintain the garment’s original quality.
Hand Wash (Alternative): If you choose to wash at home, gently press by hand in strictly cold water using a neutral, wool-safe detergent. Never use a washing machine, and avoid twisting or wringing the fabric.
Reshape While Wet: If hand washed, gently smooth out any wrinkles and carefully reshape the garment to its original dimensions while it is still damp.
How to Dry & Store
Dry Flat: To maintain the clean silhouette and prevent stretching after home washing, always dry flat in the shade.
No Tumble Dry: Please avoid using a dryer entirely. Heat and friction will cause natural fibers to shrink and felt severely.
Storage: We strongly recommend folding your knitwear for storage. Hanging knitwear on a hanger will stretch the fabric and distort the shoulders over time.
Important: A Note on Care & Fit
Water & Shrinkage: While dry cleaning minimizes changes to the fabric, choosing to hand wash will result in slight natural shrinkage.
The "Live" Fit: If the knit feels slightly snug after hand washing, the resilient natural fibers will relax as you wear it, naturally conforming to your body for a comfortable fit.
Sizing Tip: If you prefer a more relaxed or loose fit from the start, we recommend purchasing one size up.
Enjoy authentic Japanese craftsmanship without the international wait.
Every piece is knitted in our Osaka factory, but dispatched directly from our US warehouse.
- Fast & Free: Packed within 1-2 business days and delivered via UPS (3-6 days) at no extra cost.
- No Hidden Fees: Because it ships domestically, you’ll never face surprise import duties or customs delays.
We want you to feel as confident wearing our knitwear as we do making it. If the fit isn’t perfect, returning or exchanging it is completely hassle-free.
- 100% Free (No Shipping to Japan): We provide a prepaid UPS return label. You pay zero return postage, and everything is handled directly through our US warehouse.
- 30-Day Window: Take your time. You have 30 days from delivery to return or exchange any unworn, unwashed item with its original tags.
- Fast & Seamless Exchanges: Need a different size? Just email us. Once your return drops at our US facility, we’ll immediately ship your replacement from our local stock.
Email : support@moon-castle.jp
*Note: Sale items are final sale.
Crafted in Japan: The Lamb's Wool, Cashmere & Silk knit
Designed for the sophisticated wardrobe, this mid-gauge crewneck is a versatile essential that works beautifully on its own or as a refined layer. (Model is 182 cm / 5'11" and wearing size L)

Offering a exceptionally soft, lightweight feel with reliable warmth, it elevates your everyday styling with ease. (Model is 182 cm / 5'11" and wearing size L)
The Fine Lamb's Wool Blend
The foundation of this sweater is fine Lamb's Wool, sourced from Merino lambs at just five to seven months old. These first-shear fibers are naturally softer and more supple than mature wool, providing a clean luster and a comfortable, itch-free texture.
To enhance this exceptional base, we carefully source a blended yarn that incorporates cashmere for added softness and heat retention, alongside silk for a smooth touch and a subtle sheen.

Knitted in a versatile mid-gauge, the fabric offers substantial warmth while remaining lightweight against the body. (Model is 182 cm / 5'11" and wearing size L)
Calculated Details for a Flawless Silhouette
Careful attention to detail ensures a clean silhouette that holds its shape wear after wear:
The Neckline: Finished with classic 2x2 ribbing and balanced tension. It sits comfortably around the neck without feeling tight, offering a neat and settled appearance.

The Sleeves: Carefully patterned to ensure comfortable mobility and a clean, classic profile.

The Hem: Designed for a gentle, secure hold. It helps block out cold drafts and maintain a sharp line without feeling constricting, allowing the knit to drape naturally.

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