Free shipping on all orders over $80

Please make sure your address is complete and that any apartment or house number or letter is not missing. If your order has shipped additional fees may apply for updates or corrections with the carrier. PUMP! is not responsible for an incorrect address once it has left its facilities.

No P.O. Boxes Allowed. Carriers no longer deliver to P.O. Boxes.

Please consider you may have to pay an additional shipping cost if your area is considered as a remote area for the carrier, we will contact you if this case happens.

Size Chart


Boost Sidecut Brief

  • 45mm wide deep green/white/black striped waistband with white logo
  • Dark green stretch cotton front panels with sporty white micromesh piping dividers to the cup
  • Black micromesh cup with black cotton liner and large sporty White Micromesh contrasted piping and contrast divider baseball stitch
  • White supportive leg and butt elastics
  • Black and white side support bands
  • Black cotton backside with thermal printed BOY insignia


Free Shipping on all orders over US$80

Secure payments

This SideCut brief delivers in every way. It’s sexy, stylish and versatile. its cotton backside has you covered but unlike your usual brief it has open sides with detailed support bands that tie in seamlessly with the supportive leg and butt elastics. performance meets sexy style.

Weight N/A

S, M, L, XL






cotton 72% – nylon 18% – elastane 10%

Boost Sidecut Brief | PUMP! Underwear | 11

Customer Reviews

Based on 6 reviews
James Dunnigan (United States)
Love them

Great material and fit.

Kiryl Ufimtsau (United States)
Boost Sidecut Brief

I did like the material and shape. But still not sure how I feel about side cuts.

Ike H. (United States)
Really Fun!

I thought I'd try a pair of these sidecuts, and I was very pleased I did! I think a lot of male underwear can be rather boring, but I really enjoy the innovating PUMP! is doing for male undergarments. Besides being unique they are super comfy. I'm a smol boi, and the waist band is a little loose. These are the only product from PUMP! I've had this problem with, and it's isn't a large issue. Only if I'm laying down is it noticeable. They are super hot tho! If you aren't a teeny creature like me you I wouldn't hesitate, and if you are just be aware it might look a little loose around the waist.

Jordan Parker (United States)
i love these!

i absolutely love these the only thing is the waist band isn’t as tight as i’d like it because i’m so skinny when i lay down or something the waist band feels loose

MattCH (United States)
I like these a lot.

I like the design and feel of these a lot and the color contrast as always is super cool. I think the cut away on the sides of the waist band is a cool detail and refresh. If you already have other products from Pump these are consistent to the size of your other stuff.

Create an account

Please select all the ways you would like to hear from us

Your personal data will be used to support your experience throughout this website, to manage access to your account, and for other purposes described in our privacy policy.

Password Recovery

Lost your password? Please enter your username or email address. You will receive a link to create a new password via email.


Boost Sidecut Brief