What You're Actually Getting With Buttercore Fabric
Buttercore isn't a single fiber. It's a blend — usually a polyester-spandex mix — engineered for that smooth, almost silken hand feel that separates it from standard athletic polyester. Athletic Works uses it across their performance line, and the shorts are one of the more consistent applications. The fabric is lightweight, wicks moisture reasonably well, and doesn't hold onto body odor the way cheap polyethylene blends do. That last part matters more than people admit.The cut is generally relaxed with a mid-thigh length, elastic waistband with a drawstring, and side pockets that are shallow enough that you shouldn't stuff your phone in them during a run. They work fine for gym sessions, casual wear, or light hiking. They are not built for anything involving heavy abrasion or extended outdoor exposure. I bought a pair of these on a whim at Walmart about two years ago and have worn them almost exclusively for gym workouts since. Here is what actually happens after months of use, not the marketing copy. These run slightly large out of the package. I normally wear a medium in most athletic brands and the medium in these felt loose through the hip and thigh. The drawstring helps, but if you have a narrower waist relative to your hips, you will be cinching it down a lot and the waistband will bunch. I ended up sizing down to a small and that fit much better. If you are between sizes, go with the smaller one. The fabric has enough stretch to accommodate a tighter cut without feeling restrictive.
Buttercore wicks sweat, but it does not dry instantly. During a HIIT session where I was genuinely sweating, the shorts absorbed moisture and stayed damp for maybe twenty to thirty minutes after I stopped moving. They never felt heavy or waterlogged like some cheaper blends do, but they are not magic. If you are doing interval training where you alternate between high intensity and rest periods, expect a damp patch in the center of the shorts during the rest phases. For steady-state cardio or weight training, the moisture management is perfectly adequate. One edge case I ran into: wearing these in cold weather during outdoor runs in late fall. The fabric gets cold quickly when damp and there is almost no wind resistance. I was running in about forty-degree weather and the shorts felt like ice against my thighs after ten minutes. I switched to tights for anything below fifty degrees and these went back to being a spring and summer staple. That is worth knowing before you buy a full season's worth of workout clothes based on summer conditions.
Durability After Wash Cycles
I wash these in cold water on a gentle cycle and hang them to dry. I do not use fabric softener because it coats the fibers and reduces wicking performance over time. After about forty wash cycles, the fabric still feels soft. The elastic in the waistband has not degraded noticeably. The stitching around the pockets is intact. The color has faded slightly but nothing dramatic. These are not going to fall apart, but they are not built for decades of hard use either. Expect roughly a year to eighteen months of regular gym use before you notice meaningful wear. Most reviewers complain about these shorts and the issue is usually one of two things. First, they expect a lined short and these are unlined. If you want compression shorts underneath, that works fine. If you expect a built-in liner for modesty during certain movements, you will be disappointed. Second, people toss them in the dryer on high heat. The spandex blend degrades faster with high heat and you will lose some of that stretch recovery. Cold wash, air dry. That is it. Another thing nobody mentions: the side pockets are not secure enough for anything faster than a walk. If you put your phone in there and jog, it bounces. Use a armband or a different pocket for your phone. The shorts have a small back pocket with a snap closure that is marginally better but still not ideal for running.
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Value Assessment
These typically retail between eighteen and twenty-five dollars depending on the sale cycle. For that price point, they are competitive. You can find similar shorts from Old Navy or Amazon brands in the same range, but the Buttercore fabric is noticeably softer than the standard poly-spandex offerings at that price. If softness against the skin is a priority and you are not doing extreme sports, these are a solid choice. If you need reinforced seams, deep secure pockets, or serious wind resistance, look elsewhere. Brands like Nike or Under Armour offer comparable shorts at higher prices with better pocket engineering, but the fabric feel is usually rougher.
Bottom Line
The Athletic Works Buttercore shorts are what I would call honest athletic wear. They do what they say they do without exaggeration. The fabric is comfortable, the fit is reasonable if you size down, and the price is fair. They will not transform your workout, but they also will not sabotage it. I keep wearing the same pair because they are reliable, not because they are exceptional. That is usually the best category for workout gear anyway.
