Just saw this thread. I've spent years testing gear for endurance training and honestly, flagship models often trade durability for features. In my experience, the moisture seals on those high-end units aren't built for marathon prep. I actually ruined a pair of expensive Sony buds a few years back because they just couldn't handle the salt. Technically, you're better off looking at the Sony LinkBuds S Noise Canceling Earbuds. They have an IPX4 rating for sweat and they're much lighter than the XM5s, which helps them stay put during sprints. Over the years, I've found that a lighter bud always beats a bulky one for running. Another great alternative is the Sony LinkBuds Open Ring Earbuds. These use a physical wing support that locks into the ear ridge, providing a much more secure fit. Both options are way under your 300 dollar limit too.

Honestly, unfortunately Sony really dropped the ball for heavy gym use with their flagship line. I have had issues with both the Sony WH-1000XM5 Wireless Noise Canceling Headphones and the newest buds when things get sweaty. Whatever you do, dont get those over-ears for cardio. Those pads are basically sponges and since there is zero IP rating, you are just asking for a hardware failure or at least some nasty smelling pleather. Its not as good as expected for the premium price. The Sony WF-1000XM5 Truly Wireless Earbuds are a better bet but those foam tips are finicky during sprints... they tend to wiggle out once you start sweating hard. Switching to the Sony LinkBuds S Noise Canceling Earbuds IPX4 for marathon prep was the only way to go. They are way lighter and stay locked in better during high-impact movement. The ANC is a step down from the flagships, but they actually survive the workout and wont fall out mid-stride.

Look, if you're training for a half marathon, you gotta stop looking at the premium lifestyle gear. The high-end stuff like the XM5s is built for office commutes and flights, not for heavy salt and sweat. I've seen too many people fry their expensive cans because moisture got into the sensors. Since you need something by Friday and want it to stay put during sprints, you really should check out the Sony Float Run WI-OE610. They have an off-ear design so you don't get that annoying thumping sound every time your heel hits the pavement, and they basically cannot fall off your head because of the neckband. If you're dead set on in-ears with noise canceling, maybe look at the Sony WF-C700N Truly Wireless Noise Canceling Earbuds. They're way lighter than the flagships so they dont shake loose when you're hitting your stride. Just be careful though, even with an IPX4 rating, you gotta be diligent about cleaning the salt off the charging pins. I've seen those fail way more often than the actual drivers. Stick to the sports-specific designs or you'll just be throwing money away in three months.

Subbing for updates