As always the amazon.com pricing and processing and shipping speed can't be beat. Pearl iZUMi Men's X-Alp Enduro III Spinning Shoe . My first Pearl iZUMi product and, it's not perfect. I would buy it again so long as the work around I've mentioned work or until I found something better that meets my needs. I haven't yet in 15 years of clipped in riding. I ride a Specialized Robaix carbon road bike and MTN bike on the street, I had been using Specialized, Sidi, Shimano shoes and the Shimano SPD 51 cleats and never lost a screw nor had to use locktite. Occasionally when checking the screws after long periods of time when I go to tighten a screw I notice it's a little loose, not ready to fall out.  I had read another review complaining that PI Men's X-Alp Enduro III , the screws had come loose. I made sure the screws were tight when I installed the SPD cleats the first time. My first ride out wearing PI shoes, initially planned 5 miles, cut short two miles later when I stopped and put my feet down and couldn't clip out on the right shoe and I hit the ground. I have been riding various SPD, and other clip systems for about 15 years and I couldn't explain what had just happened, because I had never experienced losing  a whole SPD screw in two miles before. when I hit the ground the shoe luckily came unclipped as my butt hit the ground. I thought at first I had misaligned the cleat, but it had worked normally when I had tested it before taking off when I checked both sides of my new SPD pedals and my new PI Men's X-Alp Enduro III  and new SPD 51 cleats. I decided to ride on and tried to clip in with my right side, but couldn't and realized the spd on the right shoe had somehow come misaligned. I reached down and was able to move the SPD and see the screw missing. I didn't have an extra spd screw, and decided to head home, while trying to ride home, the spd aligned itself and clipped in. When I got home and onto the carport I was careful to unclip my left foot first and found I couldn't unclip my right no matter how much I twisted. I used the car for balance and decided since I couldn't unclip my right shoe I would take off the PI Men's X-Alp Enduro III . I was able to remove the shoe from my foot. It took a couple of hours to remove the shoe from the pedal. I had to Spin the shoe completely and unscrew spd.  I then used channel locks to twist the spd from my pedals. I tried to ride them again just tightened as all others shoes which I have used in 15 years without locktight and in a 1 mile ride 2 screws had come loose again. So locktight the spd screws to these Pear izumi shoes or they will come loose. Hopefully locktite works otherwise they're useless without changing out the plate that comes with this Pearl izumi shoe. The shoe is easy to walk in if you have break down and around the house and doesn't slip. the tongue is too narrow and the pushing and pulling repositions it and makes it uncomfortable  and you have to stop and pull it straight to prevent blisters. The shoe is reasonably ventilated with good reflective piping. I love that there's no obstruction around the SPD cleat and clipping in and out is easy with my Shimano PD-M647 Clip less Pedal with Outer Cage. The rubber on the sole if this PI is fantastically sticky on concrete, tile and asphalt. I have narrow ankles and need a tighter fit from the strap closest my ankle. My Sidi shoe has an adjustable and reposition able strap that keeps the ankle tight enough to really efficiently power through on the bicycle but the engineers designed the bottoms like football shoe cleats and they are so hard you slip and slide with every step. This pearl Izumi shoe does not have a reposition able strap around the ankle which prevented a tight enough fit, so as a work around I took an old specialized BG inner sole and placed it under the PI inner sole and the shoe. It's squishier and I'm sure not as efficient and makes me slower than using the sidi or specialized carbon road shoes, but I don't race and ride alone most of the time in the hot 105 degree Texas desert where there's intermittent cell phone service and being able to safely walk 5 to 10 miles home is more important than speed. Sometimes you can't prepare for everything like the day I was riding my road bike and ran into gravel on the road that pinched and unremarkably tore 6 heavy duty slime inner tubes between the gravel and rim and no cell service. I wish I'd of had these Pearl Izumi shoes that day instead of the Sidi's which slip and slide every step on asphalt or concrete and had to walk off of the asphalt on the sand and dirt of the desert. Luckily I was able to hitch a ride after an hour of limping along carrying my bike.