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Home / MNTD Men's Basics / Men's ActivTemp™ Boxer Brief 5"

Men's ActivTemp™ Boxer Brief 5"

$26.00 USD

Active temperature regulation

Moisture-wicking Pristine Pouch™

Super breathable with odor protection

Ultra-soft & stretchy moisture-wicking fabric

Won’t ride up, bunch, or sag

| Quetzal Green
| Quetzal Green
| Quetzal Green
| General
| General

Color: Quetzal Green Limited Edition

Size:

True to Size

•

Size:

Size and Fit Guide

Free Shipping on orders $100+

Shipping

Shipping

Processing Timelines

Please allow 1-2 business days for our warehouse team to pack and ship your order. During peak periods such as sales, holidays and product launches, please allow up to 4 business days for us to process your order. Once an order is placed, we cannot guarantee any address updates, order changes or cancellations. Orders placed on Friday after 1PM will not be shipped until the following Monday.


Split Shipments

Most orders will ship from a single warehouse. However, we occasionally ship from a combination of warehouse locations, so you may receive your order in multiple parts. If items from your order ship in separate packages, we’ll send you tracking information for each package when it becomes available.

Delivery Timelines

For the most up-to-date delivery time estimates, please refer to the shipping timeline at checkout. Delivery timelines do not include processing times. See above for details. All transit times are measured in business days which are Monday-Friday, excluding holidays.

Please note, all shipping timelines are estimates and are not guaranteed.

We are not able to ship to US territories (including Puerto Rico, U.S. Virgin Islands, Guam, Northern Mariana Islands and American Samoa) at this time.
Easy Exchanges within 30 Days

MNTD

Returns & Exchanges

Built for real life. Here's how returns and exchanges work for MNTD.

  • MNTD Tops — Eligible for return or exchange within 30 days of delivery. Wear it, wash it, and see how it works. Still not happy with the fit? Let us know and we'll sort it out.
  • MNTD Underwear — Eligible for exchange or store credit within 30 days of delivery. Wear them, wash them, see how they work. We're unable to provide refunds on underwear. If you ordered multiple pairs, please open, wash, and wear one pair only before initiating an exchange.
  • MNTD Socks & Sale — Final sale. No refunds, store credits, or exchanges.

Still have questions? View our full policy here.
Rewards Members Earn 26 Points

"Perfect boxers for a busy life that makes for an easy transition between biking around, hitting the gym, and grinding it out at work. Great temperature regulation and love the wind blocking of the pouch for cold weather sports."

- Connor | Verified Reviewer

Product Description

The most comfortable boxer briefs you’ll ever wear—active or not. MNTD by Knix brings a new standard to men’s essentials with the Active Boxer Brief. Crafted with a soft, four-way stretch fabric, these briefs offer a streamlined fit that moves with your body. The flatlock seams minimize irritation, making them perfect for all-day wear, from the office to the gym. Experience the perfect balance of breathable support and a "barely there" feel that lasts from morning until night.

Keep Your Cool

Active temperature regulation that cools you down as you heat up.

Stay Spotless

The Pristine Pouch™ wicks away moisture and keeps it from showing through.

Fresher for Longer

Super breathable, anti-odor Mint Condition Technology™ for optimal freshness.

Love the Feel

Ultra-soft, moisture-wicking fabric that keeps you dry and fresh. Built to move comfortably with you, while the waistband stays in place without digging in.

No Adjustments Necessary

Designed to prevent sagging, bunching, or ride-up with durable construction that holds its shape over time.

Zoom

| Quetzal Green
| Quetzal Green
| Quetzal Green
| General
| General

How to Choose?

Essential

  • • Days you don’t need leak protection. Everyday freshness and moisture wicking.
  • tsp
    0 tsp

Heavy

  • • Extra peace of mind. For the first days of your cycle, light bladder leaks, or a full night's sleep without a leak.
  • tsp
    about 8-14 tsp
  • pad
    about 1.5-3 regular pads
  • tampon
    about 4-7 super tampons
  • cup
    about 1.5-3 menstrual cups

Light

  • • Daily freshness. For sweat, discharge, period spotting, or backup protection.
  • tsp
    about 1-3 tsp
  • pad
    about 1-3 pantyliners
  • tampon
    about 1-3 regular tampons
  • cup
    about 0.5 menstrual cups

Moderate

  • • For mid-cycle flow, surprise cough or sneeze leaks, or a really sweaty spin class.
  • tsp
    about 4-8 tsp
  • pad
    about 1-1.5 regular pads
  • tampon
    about 2-4 super tampons
  • cup
    about 0.5-3 menstrual cups

Ultra

  • • Ultimate peace of mind. For the heaviest period days, light bladder leaks, unexpected postpartum flow, or overnight protection.
  • tsp
    about 15-20 tsp
  • pad
    about 1.5-2.5 super pads
  • tampon
    about 7-11 super tampons
  • cup
    about 2-3 menstrual cups

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Underwear that overperforms

Active Cooling. Targeted Freshness.

Performance underwear with active temperature regulation and a moisture-wicking pouch designed to keep you cool, dry, and comfortable all day.

Active Temperature Regulation

Fabric responds to your body temperature, cooling you as you heat up.
5.0
Rated 5.0 out of 5 stars
Based on 3 reviews
Total 5 star reviews: 3 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
100%would recommend this product
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3 reviews
  • Rated 5 out of 5 stars
    4 months ago
    Men’s boxer brief

    Great fabric, great fit. My husband was surprised to find they do not have the slit in the front, but 5 stars anyway.

    Kathryn B.
    Verified Buyer
    Reviewing
    Men's ActivTemp™ Boxer Brief 5"
    Was this helpful?
  • Rated 5 out of 5 stars
    4 months ago
    Mens boxers

    Bought these for my son and he really likes them for running and says they they don’t ride up with exercise.

    Corina D.
    Verified Buyer
    Reviewing
    Men's ActivTemp™ Boxer Brief 5"
    Was this helpful?
  • Rated 5 out of 5 stars
    5 months ago
    Men’s Active Boxer Brief 5”

    My Husband love this underwear he says they make him very comfortable for work and everyday wear as well.

    Shera C.
    Verified Buyer
    Reviewing
    Men's ActivTemp™ Boxer Brief 5"
    Was this helpful?

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