Will these be compatible with MX riding boots that up come up to cover the shin?

Yes - I’m wearing mine out riding as I type this, they work great with full height Mx boots, they jut barely Overlap and no discomfort

What are you tips on sizing?

If you're an adult, I'd go with the large/xtra large. For reference, I'm 5'10" and 155 lbs. The other size would probably fit kids legs. My upper thigh usually falls in the large/xtra large sizing on knee pads, so that is how I buy them. The pair that I received do not look exactly like those in the photo in that the upper portion is closer to, and has a wider attachment point, to the lower portion. They work fine though.

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🛡️ Ride Bold, Protect Smart – Because Your Knees Deserve the Best

NEXT LEVEL PROTECTION - CE certified armor with impact-absorbing padding shields your knees from every angle.
STAY COOL UNDER PRESSURE - Advanced vented panels and 3D mesh prevent heat buildup, keeping you fresh on the move.
MOVE FREELY RIDE CONFIDENTLY - Innovative flexion channel bends naturally with your knee for unrestricted mobility.
PRECISION FIT MAXIMUM COMFORT - Dual strap system ensures a secure, adjustable fit tailored for all-day wear.
LIGHTWEIGHT ARMOR HEAVYWEIGHT DEFENSE - Asymmetrical ergonomic design offers extended coverage without bulk.

The Alpinestars Bionic Plus Knee Protectors (Large/XL) combine CE-certified impact protection with ergonomic design, featuring dual adjustable straps, vented 3D mesh for breathability, and a flexion channel for natural knee movement—delivering lightweight, breathable, and secure knee defense for serious riders.

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