10 Best Triathlon Shorts 2026 in the United States

The MY KILOMETRE Mens Triathlon Shorts are designed with triathletes in mind, especially those doing long-distance races. The fabric blend of regenerated polyamide and spandex offers a good balance of stretch, durability, and chlorine resistance, making these shorts suitable for swim-bike-run transitions, including indoor pool swims. The UPF 50+ protection is an added bonus for outdoor training or events.

The padding, labeled as MK TRI 2.0 multi-density chamois, is tailored for the aero position seen in cycling and also provides comfort during the run. This means you get a cushion that supports long rides but doesn't bulk up, helping reduce discomfort. Fit-wise, the adjustable drawstring ensures you can customize the waist tightness, and the ultra-thin elastic leg grippers hold the shorts in place without causing the usual silicone grip irritation, which is common in many cycling shorts.

Practicality is enhanced by nutrition storage pockets on each side of the legs. These easy-access pockets allow you to grab gels or snacks quickly while on the bike or running, a feature triathletes find very useful. The flat locked stitching helps reduce chafing by following your body’s shape and adds strength to the shorts. One drawback might be the care instructions, as they require hand washing, which might be inconvenient for some users. Also, the product is imported, so sizing could vary slightly compared to domestic brands. These shorts provide solid performance features for triathletes seeking comfort, practical storage, and durability, especially benefiting those who prioritize swim resistance and sun protection during their training or races.

The MY KILOMETRE Triathlon Shorts are designed for athletes seeking performance and comfort in long-distance races. The main fabric is a blend of 78% Regenerated Polyamide and 22% Xtra Life Lycra, which offers moderate compression, chlorine resistance, and UPF 50+ protection. These features make the shorts suitable for both indoor pool swims and outdoor activities.

The inclusion of accessible nutrition storage pockets on the sides of the legs is a thoughtful addition for easy access during bike rides or runs, enhancing convenience for athletes. The MK TRI2.0 MULTI DENSITY CHAMOIS is specifically designed to provide comfort in the aero position, which is crucial for long cycling sessions and transitions to running. This padding aims to maximize performance without compromising comfort.

The ultra-thin and ultra-light elastic leg grippers ensure a snug fit without causing silicone discomfort, adding to the comfort and flexibility of the shorts. Flat locked stitching is used to prevent chaffing and enhance durability, benefiting those who engage in rigorous activities. However, the shorts require hand washing, which might be inconvenient for some users. Additionally, the drawstring closure might not be preferred by everyone, as some might find it less secure compared to other closure types. Despite these minor drawbacks, the MY KILOMETRE Triathlon Shorts are a strong contender for triathletes looking for reliable, comfortable, and performance-oriented gear.

The CASTELLI Men’s Tri Short is designed for triathletes who want comfort and functionality across swimming, biking, and running. It features the KISS Tri seat pad, which provides excellent comfort on the bike without feeling bulky during the run—an important balance for triathlon shorts. The shorts have a secure fit thanks to an inside drawcord and SnapLock fastener, keeping them in place through all stages of a race. The GIRO3 leg grippers are effective in preventing the shorts from shifting, enhancing stability during intense activity. A handy rear utility pocket offers space for nutrition gels or small essentials, which is very useful during long sessions.

The fabric includes UPF 50+ protection, shielding your skin from harmful sun rays during outdoor training or races. The shorts have a high-rise fit, which some athletes find more comfortable for triathlon movements. Care requires hand washing, which might be less convenient for some users. Weighing just 6.4 ounces, these shorts are lightweight and made either in the USA or imported.

If you’re looking for a reliable, versatile tri short that balances padding comfort, fit security, and sun protection, CASTELLI’s offering is a solid choice, especially if you prefer a two-piece kit and need a short that performs well across all three triathlon disciplines.