




















ICE COTTON LONG MOCKNECK
Free & Easy US Returns & Exchanges
We provide a pre-paid UPS return label. No international shipping required.
Stay Cool with MOONCASTLE’s Iconic Ice Cotton. Our signature series is the ultimate solution for humid summers. Made with premium Swiss Spoerry yarn, these knits provide a unique crispness and lasting freshness.
Available in a wide range of short-sleeve silhouettes: Polo, Mock Neck, Striped, Skipper, and Open Collar.
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.
How to Wash
While hand washing is the best way to preserve the life of your knitwear, our Ice Cotton is resilient enough for a machine wash.
- Hand Wash: Gently immerse in cold water with a fully dissolved neutral detergent.
- Machine Wash: Use a laundry net and select a "Hand Wash" or "Delicate" cycle.
- Smooth While Wet: After washing, gently smooth out any wrinkles by hand while the garment is still damp.
How to Dry & Store
- Dry Flat: To maintain the perfect silhouette, we recommend drying flat in the shade. Alternatively, hang it over a thick clothesline to avoid shoulder bumps.
- No Tumble Dry: Please avoid the dryer to prevent excessive shrinkage.
- Storage: We recommend folding your knitwear for storage to prevent stretching.
Important: A Note on Shrinkage & Fit
Due to the nature of our high-twist natural cotton, this garment will experience an initial shrinkage of approximately 1 inch after the first wash.
- The "Live" Fit: You will notice the most shrinkage immediately after washing. However, as you wear it, the knit will naturally stretch and conform to your body, returning to a comfortable fit.
- Sizing Tip: If you prefer a more relaxed or loose fit from the start, we recommend purchasing one size up.
Free Express Shipping: We provide free shipping to the USA on all orders via DHL.
Delivery Time: Most orders arrive within 5-8 business days.
No Hidden Fees: All prices include customs duties and taxes. You will not be charged any additional fees upon delivery.
Tracking: You will receive a tracking number as soon as your order is dispatched from our Osaka workshop.
Our Refund Policy
- Free US Returns: No international shipping hassles. Returns are handled at our dedicated US return center, and we cover all return shipping costs.
- 30-Day Window: Items must be returned within 30 days of delivery in their original, unwashed, and unworn condition with tags attached.
- Handling Fee: To minimize our carbon footprint and support our small-batch artisanal workshop, returns of 4 items or more from a single order will incur a $20 USD handling fee. This fee will be deducted from your final refund.
- Order Cancellations: If you wish to cancel your order after confirmation, please contact us at support@moon-castle.jp within 3 hours of placing your order. This allows our workshop to manage our shipping schedule efficiently.
- Simple Exchange Process: To get your new size or color as quickly as possible, we follow a "Return & Re-order" system. Simply return your original item for a full refund and place a new order at your convenience.
- Final Sale: Sale items are final sale and not eligible for returns or exchanges, except in cases of proven defects.
How to start a return:
- Contact us at support@moon-castle.jp with your order number.
- We will email you a pre-paid UPS/USPS shipping label immediately.
- Drop off the package at any local drop-off point. Once received at our US center, we will process your full refund
The Ice Cotton Knit: Your Go-To from Spring to Fall

This exceptional MOONCASTLE spring/summer masterpiece offers a pleasant crispness and a smooth, comfortable feel, making it ideal for Japan's hot and humid summers.

(Model is 173 cm / 5'8" and wearing size M)
With the elegant aesthetic unique to knitwear, this summer knit looks great on its own and its basic sizing also makes it suitable for layering.
The Secret to Its Coolness: Spoerry's Ice Cotton
This garment achieves its delightful crispness and refreshing coolness by utilizing Ice Cotton yarn from Switzerland's Spoerry Company. Spoerry, a long-established Swiss spinning mill with a rich tradition in cotton spinning, spent many years developing their unique "Ice Cotton." Without any chemical processing, they achieved contact coolness using only natural materials. This is done by suppressing lint through ultra-high twisting and reducing air pockets within the yarn.

As the name suggests, the fabric feels cool to the touch, making it a comfortable choice even for those who dislike the feel of synthetic fibers.

Meticulous Craftsmanship for a Superior Feel
The knit structure is a 12-gauge plain stitch, tightly knitted to create an elegant appearance. Four strands of fine Ice Cotton are used, resulting in a fabric that is both substantial and supple. The optimal material selection combined with years of accumulated expertise creates the "crispness" that is the greatest charm of this item.

Its comfortable wear has made it a continuous favorite among people worldwide since the brand's inception.
Calculated Details for a Beautiful Silhouette

The mock neck is designed with an exquisite balance, neither too low nor too high, making it an ideal design for layering under a jacket.

The sleeve ribs are designed with a perfect balance, neither too tight nor too loose.

The moderately snug hem rib sits well, making it an excellent pairing with jackets.

(Model is 173 cm / 5'8" and wearing size M)
Choose options




















