Runner boxer silhouette inspired by military runner shorts for a sleek, athletic look
Signature side insets provide a clean, flattering fit and open up the leg for comfort
100% cotton fabric ensures breathable, soft comfort for all-day wear
Functional button fly offers everyday practicality and easy wear
Shorter 3-inch inseam delivers freedom of movement without bulk
Summarized by Shop
Built like runner shorts. Worn like a Sunday.
Borrowed from classic military runner shorts and cut for the weekend. The Core Runner Boxer is loose where you want air, shaped by signature side insets so it never reads boxy, and soft 100% cotton everywhere. Fabric
100% Cotton. Soft, breathable, and natural against the skin — the boxer y
Fabric
100% cotton
Fit
Runner boxer silhouette with side insets
Rise
Mid rise
Inseam
3 inches
Fly
Functional button fly
Waistband
1.5 inch exposed elastic with engineered C In2 branding
Summarized by Shop
4.8
35 ratings
5
4
3
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1
Great fit!
Love these- an option for a boxer that’s not baggy. They fit like a glove.
P
Paul · July 23, 2026
I love this boxer.
I’ve worn these a few times already and I’m really impressed with the comfort and fit. The material feels soft, breathable, and lightweight while still giving good support throughout the day. The Grey Heather color looks clean and stylish, and the fit stays comfortable without riding up. Great for both everyday wear and workouts. Definitely one of my favorite boxer styles from C-IN2.
H
Harold · May 19, 2026
Always great item Bought many and love how great they are.