Form at mile 20
Late-race slowdown is usually a hip problem before it's a lung problem. Pelvic support keeps your stride from collapsing inward.
Marathon / Ultra Running
Built For The Marathon And The Ultra
Distance running doesn't break you with one hard effort — it breaks you with thousands of small ones. The Lock's patented 'D Band' supports the pelvic floor so your stride holds its shape when your legs stop volunteering.
Why It Works
What marathon / ultra running demands of your core
The patented "D Band" supports the pelvic floor and locks the core — the foundation every other movement is built on.
Less energy leaked
A stable pelvis means less side-to-side movement, and less side-to-side movement means less energy spent going nowhere.
Chafe-free hours
Active Cotton moves moisture instead of holding it, so hours of sweat and aid-station water don't turn into raw skin.
Held, not squeezed
The Lock supports the anatomy safely rather than just compressing everything, which is what makes long efforts bearable.
In Their Words
"Every stride translates more force into the ground. I stopped feeling my hips fatigue at mile 18. The Lock keeps my core and pelvic floor stable the whole way — that's the difference between finishing strong and just finishing."
Ultra-distance runner
Watch
See it in action
Professional Sprinter Monzavous "Rae" Edwards on Lock Apparel
The Technology
Patented, not just tight
The same platform every marathon / ultra running athlete on this page is wearing. You only need to wear The Lock once to feel the difference that separates it from any comparable short on the market.
The D Band
A patented band that supports the pelvic floor and holds the anatomy safely against the pubic symphysis — stability where compression alone does nothing.
Differentiated fabrication
The panels distinguish between muscle groups, so support lands where it's needed and freedom of movement stays where it matters.
Active Cotton
100% cotton engineered to move moisture away from the skin, resist odour, and stay soft without going heavy, sticky, or cold.
More Athletes
Same platform. Different arenas.
"As an ex-Olympic hurdler, I'm amazed that a pair of running shorts could actually enhance my performance. After only 2 weeks the small aches and pains that are just part of being an athlete have miraculously disappeared. The Lock is truly a performance-enhancing piece of gear that every athlete should add to their arsenal."
Mark McKoy · Olympic Gold Medalist, 110MH — Barcelona 1992View →
"I love Lock Apparel's Active Cotton because of how it feels against my skin. During summer training, the breathability made me feel cooler and less sticky. I really enjoy the fact that there is no odor. I am basically incapable of wearing anything else now that I know what Active Cotton feels like."
Leilani Tam von Burg · Pro Biathlon Champion, MunichView →
"As an athlete I've tried many compression pieces, yet they do not live up to The Lock. Squatting with The Lady Lock has really made a difference — I focus more on stabilizing my core because of the fit and compression around the mid-line. I feel more secure and stronger. I do not squat without it."
Lacey Van Der Meral · Burlington, Ont.View →
What To Wear
Picks for marathon / ultra running
Questions