Men's Modal Boxer Briefs | Seamless Breathable Mid-Waist Underwear
- Material details by product
- Check exact composition
- Review care instructions
- Free shipping Over $50
Luxury Softness, Built for Real Life
Not all underwear is created equal. MOSSRIVER modal boxer briefs are crafted from 40s high-count modal — a fabric so smooth and silky, it redefines what everyday comfort feels like. From morning commutes to late-night workouts, these briefs move with you.
✨ Key Features
- 40s High-Count Modal Fabric — Incredibly smooth, silky touch with superior skin-friendly breathability
- Seamless Construction — Zero pinching, zero chafing — unrestricted comfort all day long
- Mid-Waist Ergonomic Fit — Conforms to your body shape for a supportive, non-constricting hold
- 95% Modal + 5% Spandex Crotch Panel — Exceptional elasticity and supportive hold, even during prolonged sitting or intense movement
- All-Season Breathability — Eliminates stuffiness and stickiness; keeps you fresh and dry in any weather
🎨 Available Colors
Blue · Black · Grey
📐 Size Guide
Available in S / M / L / XL / XXL / XXXL / XXXXL — refer to our size chart for the best fit.
🛒 Why MOSSRIVER?
Premium materials, thoughtful construction, and a fit that works as hard as you do. Because great basics shouldn't be a compromise.
⚠️ Low Stock - Restocking Soon
Last updated: August 8, 2026
We want you to know what to expect after placing an order. The checkout page is the final source of truth for the destination, rate, and delivery option available for your order.
1. Current shipping region
This store currently lists shipping within the United States. If checkout does not offer your destination, please contact service@themossriver.com before ordering.
2. Processing time
- Orders are normally processed within 1–3 business days, excluding weekends and holidays.
- New drops, holidays, or unusually high order volume may add 1–2 business days.
3. Shipping options and rates
- Standard shipping: usually 5–8 business days after processing; $4.99 or free on orders $49+.
- Expedited shipping: usually 2–4 business days after processing; $7.99 when available at checkout.
Delivery estimates are estimates, not guarantees. The rate and option shown at checkout control if they differ from this summary.
4. Tracking
When your order ships, we send a confirmation email with tracking information. Please allow up to 24–48 hours for the carrier page to begin updating.
5. Delays or a package that appears lost
Carrier disruptions, weather, and address issues can delay delivery. If your package is delayed or appears lost, email service@themossriver.com with your order number and we will help review it.
6. Address changes
Contact us as soon as you notice an address error. We cannot guarantee changes after fulfillment or shipment, but we will review the request promptly.
7. Packaging
We aim to use minimal, recyclable packaging where practical while protecting the products during transit.
Material details vary by product and collection. Before ordering, review the individual product page for the exact composition, fabric feel, fit, care instructions, and availability.
For family-matching holiday styles, do not infer one material for the entire collection. Use the specific product page and its listed composition as the source of truth.